'%d'.
*
* @since 2.8.0
*
* @see wpdb::prepare()
* @see wpdb::insert()
* @see wpdb::update()
* @see wpdb::delete()
* @see wp_set_wpdb_vars()
* @var array
*/
public $field_types = array();
/**
* Database table columns charset.
*
* @since 2.2.0
*
* @var string
*/
public $charset;
/**
* Database table columns collate.
*
* @since 2.2.0
*
* @var string
*/
public $collate;
/**
* Database Username.
*
* @since 2.9.0
*
* @var string
*/
protected $dbuser;
/**
* Database Password.
*
* @since 3.1.0
*
* @var string
*/
protected $dbpassword;
/**
* Database Name.
*
* @since 3.1.0
*
* @var string
*/
protected $dbname;
/**
* Database Host.
*
* @since 3.1.0
*
* @var string
*/
protected $dbhost;
/**
* Database handle.
*
* Possible values:
*
* - `mysqli` instance during normal operation
* - `null` if the connection is yet to be made or has been closed
* - `false` if the connection has failed
*
* @since 0.71
*
* @var mysqli|false|null
*/
protected $dbh;
/**
* A textual description of the last query/get_row/get_var call.
*
* @since 3.0.0
*
* @var string
*/
public $func_call;
/**
* Whether MySQL is used as the database engine.
*
* Set in wpdb::db_connect() to true, by default. This is used when checking
* against the required MySQL version for WordPress. Normally, a replacement
* database drop-in (db.php) will skip these checks, but setting this to true
* will force the checks to occur.
*
* @since 3.3.0
*
* @var bool
*/
public $is_mysql = null;
/**
* A list of incompatible SQL modes.
*
* @since 3.9.0
*
* @var string[]
*/
protected $incompatible_modes = array(
'NO_ZERO_DATE',
'ONLY_FULL_GROUP_BY',
'STRICT_TRANS_TABLES',
'STRICT_ALL_TABLES',
'TRADITIONAL',
'ANSI',
);
/**
* Backward compatibility, where wpdb::prepare() has not quoted formatted/argnum placeholders.
*
* This is often used for table/field names (before %i was supported), and sometimes string formatting, e.g.
*
* $wpdb->prepare( 'WHERE `%1$s` = "%2$s something %3$s" OR %1$s = "%4$-10s"', 'field_1', 'a', 'b', 'c' );
*
* But it's risky, e.g. forgetting to add quotes, resulting in SQL Injection vulnerabilities:
*
* $wpdb->prepare( 'WHERE (id = %1s) OR (id = %2$s)', $_GET['id'], $_GET['id'] ); // ?id=id
*
* This feature is preserved while plugin authors update their code to use safer approaches:
*
* $_GET['key'] = 'a`b';
*
* $wpdb->prepare( 'WHERE %1s = %s', $_GET['key'], $_GET['value'] ); // WHERE a`b = 'value'
* $wpdb->prepare( 'WHERE `%1$s` = "%2$s"', $_GET['key'], $_GET['value'] ); // WHERE `a`b` = "value"
*
* $wpdb->prepare( 'WHERE %i = %s', $_GET['key'], $_GET['value'] ); // WHERE `a``b` = 'value'
*
* While changing to false will be fine for queries not using formatted/argnum placeholders,
* any remaining cases are most likely going to result in SQL errors (good, in a way):
*
* $wpdb->prepare( 'WHERE %1$s = "%2$-10s"', 'my_field', 'my_value' );
* true = WHERE my_field = "my_value "
* false = WHERE 'my_field' = "'my_value '"
*
* But there may be some queries that result in an SQL Injection vulnerability:
*
* $wpdb->prepare( 'WHERE id = %1$s', $_GET['id'] ); // ?id=id
*
* So there may need to be a `_doing_it_wrong()` phase, after we know everyone can use
* identifier placeholders (%i), but before this feature is disabled or removed.
*
* @since 6.2.0
* @var bool
*/
private $allow_unsafe_unquoted_parameters = true;
/**
* Whether to use the mysqli extension over mysql. This is no longer used as the mysql
* extension is no longer supported.
*
* Default true.
*
* @since 3.9.0
* @since 6.4.0 This property was removed.
* @since 6.4.1 This property was reinstated and its default value was changed to true.
* The property is no longer used in core but may be accessed externally.
*
* @var bool
*/
private $use_mysqli = true;
/**
* Whether we've managed to successfully connect at some point.
*
* @since 3.9.0
*
* @var bool
*/
private $has_connected = false;
/**
* Time when the last query was performed.
*
* Only set when `SAVEQUERIES` is defined and truthy.
*
* @since 1.5.0
*
* @var float
*/
public $time_start = null;
/**
* The last SQL error that was encountered.
*
* @since 2.5.0
*
* @var WP_Error|string
*/
public $error = null;
/**
* Connects to the database server and selects a database.
*
* Does the actual setting up
* of the class properties and connection to the database.
*
* @since 2.0.8
*
* @link https://core.trac.wordpress.org/ticket/3354
*
* @param string $dbuser Database user.
* @param string $dbpassword Database password.
* @param string $dbname Database name.
* @param string $dbhost Database host.
*/
public function __construct(
$dbuser,
#[\SensitiveParameter]
$dbpassword,
$dbname,
$dbhost
) {
if ( WP_DEBUG && WP_DEBUG_DISPLAY ) {
$this->show_errors();
}
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbname = $dbname;
$this->dbhost = $dbhost;
// wp-config.php creation will manually connect when ready.
if ( defined( 'WP_SETUP_CONFIG' ) ) {
return;
}
$this->db_connect();
}
/**
* Makes private properties readable for backward compatibility.
*
* @since 3.5.0
*
* @param string $name The private member to get, and optionally process.
* @return mixed The private member.
*/
public function __get( $name ) {
if ( 'col_info' === $name ) {
$this->load_col_info();
}
return $this->$name;
}
/**
* Makes private properties settable for backward compatibility.
*
* @since 3.5.0
*
* @param string $name The private member to set.
* @param mixed $value The value to set.
*/
public function __set( $name, $value ) {
$protected_members = array(
'col_meta',
'table_charset',
'check_current_query',
'allow_unsafe_unquoted_parameters',
);
if ( in_array( $name, $protected_members, true ) ) {
return;
}
$this->$name = $value;
}
/**
* Makes private properties check-able for backward compatibility.
*
* @since 3.5.0
*
* @param string $name The private member to check.
* @return bool If the member is set or not.
*/
public function __isset( $name ) {
return isset( $this->$name );
}
/**
* Makes private properties un-settable for backward compatibility.
*
* @since 3.5.0
*
* @param string $name The private member to unset.
*/
public function __unset( $name ) {
unset( $this->$name );
}
/**
* Sets $this->charset and $this->collate.
*
* @since 3.1.0
*/
public function init_charset() {
$charset = '';
$collate = '';
if ( function_exists( 'is_multisite' ) && is_multisite() ) {
$charset = 'utf8';
if ( defined( 'DB_COLLATE' ) && DB_COLLATE ) {
$collate = DB_COLLATE;
} else {
$collate = 'utf8_general_ci';
}
} elseif ( defined( 'DB_COLLATE' ) ) {
$collate = DB_COLLATE;
}
if ( defined( 'DB_CHARSET' ) ) {
$charset = DB_CHARSET;
}
$charset_collate = $this->determine_charset( $charset, $collate );
$this->charset = $charset_collate['charset'];
$this->collate = $charset_collate['collate'];
}
/**
* Determines the best charset and collation to use given a charset and collation.
*
* For example, when able, utf8mb4 should be used instead of utf8.
*
* @since 4.6.0
*
* @param string $charset The character set to check.
* @param string $collate The collation to check.
* @return array {
* The most appropriate character set and collation to use.
*
* @type string $charset Character set.
* @type string $collate Collation.
* }
*/
public function determine_charset( $charset, $collate ) {
if ( ( ! ( $this->dbh instanceof mysqli ) ) || empty( $this->dbh ) ) {
return compact( 'charset', 'collate' );
}
if ( 'utf8' === $charset ) {
$charset = 'utf8mb4';
}
if ( 'utf8mb4' === $charset ) {
// _general_ is outdated, so we can upgrade it to _unicode_, instead.
if ( ! $collate || 'utf8_general_ci' === $collate ) {
$collate = 'utf8mb4_unicode_ci';
} else {
$collate = str_replace( 'utf8_', 'utf8mb4_', $collate );
}
}
// _unicode_520_ is a better collation, we should use that when it's available.
if ( $this->has_cap( 'utf8mb4_520' ) && 'utf8mb4_unicode_ci' === $collate ) {
$collate = 'utf8mb4_unicode_520_ci';
}
return compact( 'charset', 'collate' );
}
/**
* Sets the connection's character set.
*
* @since 3.1.0
*
* @param mysqli $dbh The connection returned by `mysqli_connect()`.
* @param string $charset Optional. The character set. Default null.
* @param string $collate Optional. The collation. Default null.
*/
public function set_charset( $dbh, $charset = null, $collate = null ) {
if ( ! isset( $charset ) ) {
$charset = $this->charset;
}
if ( ! isset( $collate ) ) {
$collate = $this->collate;
}
if ( $this->has_cap( 'collation' ) && ! empty( $charset ) ) {
$set_charset_succeeded = true;
if ( function_exists( 'mysqli_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
$set_charset_succeeded = mysqli_set_charset( $dbh, $charset );
}
if ( $set_charset_succeeded ) {
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) ) {
$query .= $this->prepare( ' COLLATE %s', $collate );
}
mysqli_query( $dbh, $query );
}
}
}
/**
* Changes the current SQL mode, and ensures its WordPress compatibility.
*
* If no modes are passed, it will ensure the current SQL server modes are compatible.
*
* @since 3.9.0
*
* @param array $modes Optional. A list of SQL modes to set. Default empty array.
*/
public function set_sql_mode( $modes = array() ) {
if ( empty( $modes ) ) {
$res = mysqli_query( $this->dbh, 'SELECT @@SESSION.sql_mode' );
if ( empty( $res ) ) {
return;
}
$modes_array = mysqli_fetch_array( $res );
if ( empty( $modes_array[0] ) ) {
return;
}
$modes = explode( ',', $modes_array[0] );
}
$modes = array_change_key_case( $modes, CASE_UPPER );
/**
* Filters the list of incompatible SQL modes to exclude.
*
* @since 3.9.0
*
* @param array $incompatible_modes An array of incompatible modes.
*/
$incompatible_modes = (array) apply_filters( 'incompatible_sql_modes', $this->incompatible_modes );
foreach ( $modes as $i => $mode ) {
if ( in_array( $mode, $incompatible_modes, true ) ) {
unset( $modes[ $i ] );
}
}
$modes_str = implode( ',', $modes );
mysqli_query( $this->dbh, "SET SESSION sql_mode='$modes_str'" );
}
/**
* Sets the table prefix for the WordPress tables.
*
* @since 2.5.0
*
* @param string $prefix Alphanumeric name for the new prefix.
* @param bool $set_table_names Optional. Whether the table names, e.g. wpdb::$posts,
* should be updated or not. Default true.
* @return string|WP_Error Old prefix or WP_Error on error.
*/
public function set_prefix( $prefix, $set_table_names = true ) {
if ( preg_match( '|[^a-z0-9_]|i', $prefix ) ) {
return new WP_Error( 'invalid_db_prefix', 'Invalid database prefix' );
}
$old_prefix = is_multisite() ? '' : $prefix;
if ( isset( $this->base_prefix ) ) {
$old_prefix = $this->base_prefix;
}
$this->base_prefix = $prefix;
if ( $set_table_names ) {
foreach ( $this->tables( 'global' ) as $table => $prefixed_table ) {
$this->$table = $prefixed_table;
}
if ( is_multisite() && empty( $this->blogid ) ) {
return $old_prefix;
}
$this->prefix = $this->get_blog_prefix();
foreach ( $this->tables( 'blog' ) as $table => $prefixed_table ) {
$this->$table = $prefixed_table;
}
foreach ( $this->tables( 'old' ) as $table => $prefixed_table ) {
$this->$table = $prefixed_table;
}
}
return $old_prefix;
}
/**
* Sets blog ID.
*
* @since 3.0.0
*
* @param int $blog_id
* @param int $network_id Optional. Network ID. Default 0.
* @return int Previous blog ID.
*/
public function set_blog_id( $blog_id, $network_id = 0 ) {
if ( ! empty( $network_id ) ) {
$this->siteid = $network_id;
}
$old_blog_id = $this->blogid;
$this->blogid = $blog_id;
$this->prefix = $this->get_blog_prefix();
foreach ( $this->tables( 'blog' ) as $table => $prefixed_table ) {
$this->$table = $prefixed_table;
}
foreach ( $this->tables( 'old' ) as $table => $prefixed_table ) {
$this->$table = $prefixed_table;
}
return $old_blog_id;
}
/**
* Gets blog prefix.
*
* @since 3.0.0
*
* @param int $blog_id Optional. Blog ID to retrieve the table prefix for.
* Defaults to the current blog ID.
* @return string Blog prefix.
*/
public function get_blog_prefix( $blog_id = null ) {
if ( is_multisite() ) {
if ( null === $blog_id ) {
$blog_id = $this->blogid;
}
$blog_id = (int) $blog_id;
if ( defined( 'MULTISITE' ) && ( 0 === $blog_id || 1 === $blog_id ) ) {
return $this->base_prefix;
} else {
return $this->base_prefix . $blog_id . '_';
}
} else {
return $this->base_prefix;
}
}
/**
* Returns an array of WordPress tables.
*
* Also allows for the `CUSTOM_USER_TABLE` and `CUSTOM_USER_META_TABLE` to override the WordPress users
* and usermeta tables that would otherwise be determined by the prefix.
*
* The `$scope` argument can take one of the following:
*
* - 'all' - returns 'all' and 'global' tables. No old tables are returned.
* - 'blog' - returns the blog-level tables for the queried blog.
* - 'global' - returns the global tables for the installation, returning multisite tables only on multisite.
* - 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.
* - 'old' - returns tables which are deprecated.
*
* @since 3.0.0
* @since 6.1.0 `old` now includes deprecated multisite global tables only on multisite.
*
* @uses wpdb::$tables
* @uses wpdb::$old_tables
* @uses wpdb::$global_tables
* @uses wpdb::$ms_global_tables
* @uses wpdb::$old_ms_global_tables
*
* @param string $scope Optional. Possible values include 'all', 'global', 'ms_global', 'blog',
* or 'old' tables. Default 'all'.
* @param bool $prefix Optional. Whether to include table prefixes. If blog prefix is requested,
* then the custom users and usermeta tables will be mapped. Default true.
* @param int $blog_id Optional. The blog_id to prefix. Used only when prefix is requested.
* Defaults to `wpdb::$blogid`.
* @return string[] Table names. When a prefix is requested, the key is the unprefixed table name.
*/
public function tables( $scope = 'all', $prefix = true, $blog_id = 0 ) {
switch ( $scope ) {
case 'all':
$tables = array_merge( $this->global_tables, $this->tables );
if ( is_multisite() ) {
$tables = array_merge( $tables, $this->ms_global_tables );
}
break;
case 'blog':
$tables = $this->tables;
break;
case 'global':
$tables = $this->global_tables;
if ( is_multisite() ) {
$tables = array_merge( $tables, $this->ms_global_tables );
}
break;
case 'ms_global':
$tables = $this->ms_global_tables;
break;
case 'old':
$tables = $this->old_tables;
if ( is_multisite() ) {
$tables = array_merge( $tables, $this->old_ms_global_tables );
}
break;
default:
return array();
}
if ( $prefix ) {
if ( ! $blog_id ) {
$blog_id = $this->blogid;
}
$blog_prefix = $this->get_blog_prefix( $blog_id );
$base_prefix = $this->base_prefix;
$global_tables = array_merge( $this->global_tables, $this->ms_global_tables );
foreach ( $tables as $k => $table ) {
if ( in_array( $table, $global_tables, true ) ) {
$tables[ $table ] = $base_prefix . $table;
} else {
$tables[ $table ] = $blog_prefix . $table;
}
unset( $tables[ $k ] );
}
if ( isset( $tables['users'] ) && defined( 'CUSTOM_USER_TABLE' ) ) {
$tables['users'] = CUSTOM_USER_TABLE;
}
if ( isset( $tables['usermeta'] ) && defined( 'CUSTOM_USER_META_TABLE' ) ) {
$tables['usermeta'] = CUSTOM_USER_META_TABLE;
}
}
return $tables;
}
/**
* Selects a database using the current or provided database connection.
*
* The database name will be changed based on the current database connection.
* On failure, the execution will bail and display a DB error.
*
* @since 0.71
*
* @param string $db Database name.
* @param mysqli $dbh Optional. Database connection.
* Defaults to the current database handle.
*/
public function select( $db, $dbh = null ) {
if ( is_null( $dbh ) ) {
$dbh = $this->dbh;
}
$success = mysqli_select_db( $dbh, $db );
if ( ! $success ) {
$this->ready = false;
if ( ! did_action( 'template_redirect' ) ) {
wp_load_translations_early();
$message = '' . __( 'Cannot select database' ) . "
\n";
$message .= '' . sprintf(
/* translators: %s: Database name. */
__( 'The database server could be connected to (which means your username and password is okay) but the %s database could not be selected.' ),
'' . htmlspecialchars( $db, ENT_QUOTES ) . ''
) . "
\n";
$message .= "\n";
$message .= '- ' . __( 'Are you sure it exists?' ) . "
\n";
$message .= '- ' . sprintf(
/* translators: 1: Database user, 2: Database name. */
__( 'Does the user %1$s have permission to use the %2$s database?' ),
'
' . htmlspecialchars( $this->dbuser, ENT_QUOTES ) . '',
'' . htmlspecialchars( $db, ENT_QUOTES ) . ''
) . " \n";
$message .= '- ' . sprintf(
/* translators: %s: Database name. */
__( 'On some systems the name of your database is prefixed with your username, so it would be like
username_%1$s. Could that be the problem?' ),
htmlspecialchars( $db, ENT_QUOTES )
) . " \n";
$message .= "
\n";
$message .= '' . sprintf(
/* translators: %s: Support forums URL. */
__( 'If you do not know how to set up a database you should contact your host. If all else fails you may find help at the WordPress support forums.' ),
__( 'https://wordpress.org/support/forums/' )
) . "
\n";
$this->bail( $message, 'db_select_fail' );
}
}
}
/**
* Do not use, deprecated.
*
* Use esc_sql() or wpdb::prepare() instead.
*
* @since 2.8.0
* @deprecated 3.6.0 Use wpdb::prepare()
* @see wpdb::prepare()
* @see esc_sql()
*
* @param string $data
* @return string
*/
public function _weak_escape( $data ) {
if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) ) {
_deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' );
}
return addslashes( $data );
}
/**
* Real escape using mysqli_real_escape_string().
*
* @since 2.8.0
*
* @see mysqli_real_escape_string()
*
* @param string $data String to escape.
* @return string Escaped string.
*/
public function _real_escape( $data ) {
if ( ! is_scalar( $data ) ) {
return '';
}
if ( $this->dbh ) {
$escaped = mysqli_real_escape_string( $this->dbh, $data );
} else {
$class = get_class( $this );
wp_load_translations_early();
/* translators: %s: Database access abstraction class, usually wpdb or a class extending wpdb. */
_doing_it_wrong( $class, sprintf( __( '%s must set a database connection for use with escaping.' ), $class ), '3.6.0' );
$escaped = addslashes( $data );
}
return $this->add_placeholder_escape( $escaped );
}
/**
* Escapes data. Works on arrays.
*
* @since 2.8.0
*
* @uses wpdb::_real_escape()
*
* @param string|array $data Data to escape.
* @return string|array Escaped data, in the same type as supplied.
*/
public function _escape( $data ) {
if ( is_array( $data ) ) {
foreach ( $data as $k => $v ) {
if ( is_array( $v ) ) {
$data[ $k ] = $this->_escape( $v );
} else {
$data[ $k ] = $this->_real_escape( $v );
}
}
} else {
$data = $this->_real_escape( $data );
}
return $data;
}
/**
* Do not use, deprecated.
*
* Use esc_sql() or wpdb::prepare() instead.
*
* @since 0.71
* @deprecated 3.6.0 Use wpdb::prepare()
* @see wpdb::prepare()
* @see esc_sql()
*
* @param string|array $data Data to escape.
* @return string|array Escaped data, in the same type as supplied.
*/
public function escape( $data ) {
if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) ) {
_deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' );
}
if ( is_array( $data ) ) {
foreach ( $data as $k => $v ) {
if ( is_array( $v ) ) {
$data[ $k ] = $this->escape( $v, 'recursive' );
} else {
$data[ $k ] = $this->_weak_escape( $v, 'internal' );
}
}
} else {
$data = $this->_weak_escape( $data, 'internal' );
}
return $data;
}
/**
* Escapes content by reference for insertion into the database, for security.
*
* @uses wpdb::_real_escape()
*
* @since 2.3.0
*
* @param string $data String to escape.
*/
public function escape_by_ref( &$data ) {
if ( ! is_float( $data ) ) {
$data = $this->_real_escape( $data );
}
}
/**
* Quotes an identifier such as a table or field name.
*
* @since 6.2.0
*
* @param string $identifier Identifier to escape.
* @return string Escaped identifier.
*/
public function quote_identifier( $identifier ) {
return '`' . $this->_escape_identifier_value( $identifier ) . '`';
}
/**
* Escapes an identifier value without adding the surrounding quotes.
*
* - Permitted characters in quoted identifiers include the full Unicode
* Basic Multilingual Plane (BMP), except U+0000.
* - To quote the identifier itself, you need to double the character, e.g. `a``b`.
*
* @since 6.2.0
*
* @link https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
*
* @param string $identifier Identifier to escape.
* @return string Escaped identifier.
*/
private function _escape_identifier_value( $identifier ) {
return str_replace( '`', '``', $identifier );
}
/**
* Prepares a SQL query for safe execution.
*
* Uses `sprintf()`-like syntax. The following placeholders can be used in the query string:
*
* - `%d` (integer)
* - `%f` (float)
* - `%s` (string)
* - `%i` (identifier, e.g. table/field names)
*
* All placeholders MUST be left unquoted in the query string. A corresponding argument
* MUST be passed for each placeholder.
*
* Note: There is one exception to the above: for compatibility with old behavior,
* numbered or formatted string placeholders (eg, `%1$s`, `%5s`) will not have quotes
* added by this function, so should be passed with appropriate quotes around them.
*
* Literal percentage signs (`%`) in the query string must be written as `%%`. Percentage wildcards
* (for example, to use in LIKE syntax) must be passed via a substitution argument containing
* the complete LIKE string, these cannot be inserted directly in the query string.
* Also see wpdb::esc_like().
*
* Arguments may be passed as individual arguments to the method, or as a single array
* containing all arguments. A combination of the two is not supported.
*
* Examples:
*
* $wpdb->prepare(
* "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d OR `other_field` LIKE %s",
* array( 'foo', 1337, '%bar' )
* );
*
* $wpdb->prepare(
* "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s",
* 'foo'
* );
*
* $wpdb->prepare(
* "SELECT * FROM %i WHERE %i = %s",
* $table,
* $field,
* $value
* );
*
* @since 2.3.0
* @since 5.3.0 Formalized the existing and already documented `...$args` parameter
* by updating the function signature. The second parameter was changed
* from `$args` to `...$args`.
* @since 6.2.0 Added `%i` for identifiers, e.g. table or field names.
* Check support via `wpdb::has_cap( 'identifier_placeholders' )`.
* This preserves compatibility with `sprintf()`, as the C version uses
* `%d` and `$i` as a signed integer, whereas PHP only supports `%d`.
*
* @link https://www.php.net/sprintf Description of syntax.
*
* @param string $query Query statement with `sprintf()`-like placeholders.
* @param array|mixed $args The array of variables to substitute into the query's placeholders
* if being called with an array of arguments, or the first variable
* to substitute into the query's placeholders if being called with
* individual arguments.
* @param mixed ...$args Further variables to substitute into the query's placeholders
* if being called with individual arguments.
* @return string|null Sanitized query string, if there is a query to prepare.
*/
public function prepare( $query, ...$args ) {
if ( is_null( $query ) ) {
return null;
}
/*
* This is not meant to be foolproof -- but it will catch obviously incorrect usage.
*
* Note: str_contains() is not used here, as this file can be included
* directly outside of WordPress core, e.g. by HyperDB, in which case
* the polyfills from wp-includes/compat.php are not loaded.
*/
if ( false === strpos( $query, '%' ) ) {
wp_load_translations_early();
_doing_it_wrong(
'wpdb::prepare',
sprintf(
/* translators: %s: wpdb::prepare() */
__( 'The query argument of %s must have a placeholder.' ),
'wpdb::prepare()'
),
'3.9.0'
);
}
/*
* Specify the formatting allowed in a placeholder. The following are allowed:
*
* - Sign specifier, e.g. $+d
* - Numbered placeholders, e.g. %1$s
* - Padding specifier, including custom padding characters, e.g. %05s, %'#5s
* - Alignment specifier, e.g. %05-s
* - Precision specifier, e.g. %.2f
*/
$allowed_format = '(?:[1-9][0-9]*[$])?[-+0-9]*(?: |0|\'.)?[-+0-9]*(?:\.[0-9]+)?';
/*
* If a %s placeholder already has quotes around it, removing the existing quotes
* and re-inserting them ensures the quotes are consistent.
*
* For backward compatibility, this is only applied to %s, and not to placeholders like %1$s,
* which are frequently used in the middle of longer strings, or as table name placeholders.
*/
$query = str_replace( "'%s'", '%s', $query ); // Strip any existing single quotes.
$query = str_replace( '"%s"', '%s', $query ); // Strip any existing double quotes.
// Escape any unescaped percents (i.e. anything unrecognised).
$query = preg_replace( "/%(?:%|$|(?!($allowed_format)?[sdfFi]))/", '%%\\1', $query );
// Extract placeholders from the query.
$split_query = preg_split( "/(^|[^%]|(?:%%)+)(%(?:$allowed_format)?[sdfFi])/", $query, -1, PREG_SPLIT_DELIM_CAPTURE );
$split_query_count = count( $split_query );
/*
* Split always returns with 1 value before the first placeholder (even with $query = "%s"),
* then 3 additional values per placeholder.
*/
$placeholder_count = ( ( $split_query_count - 1 ) / 3 );
// If args were passed as an array, as in vsprintf(), move them up.
$passed_as_array = ( isset( $args[0] ) && is_array( $args[0] ) && 1 === count( $args ) );
if ( $passed_as_array ) {
$args = $args[0];
}
$new_query = '';
$key = 2; // Keys 0 and 1 in $split_query contain values before the first placeholder.
$arg_id = 0;
$arg_identifiers = array();
$arg_strings = array();
while ( $key < $split_query_count ) {
$placeholder = $split_query[ $key ];
$format = substr( $placeholder, 1, -1 );
$type = substr( $placeholder, -1 );
if ( 'f' === $type && true === $this->allow_unsafe_unquoted_parameters
/*
* Note: str_ends_with() is not used here, as this file can be included
* directly outside of WordPress core, e.g. by HyperDB, in which case
* the polyfills from wp-includes/compat.php are not loaded.
*/
&& '%' === substr( $split_query[ $key - 1 ], -1, 1 )
) {
/*
* Before WP 6.2 the "force floats to be locale-unaware" RegEx didn't
* convert "%%%f" to "%%%F" (note the uppercase F).
* This was because it didn't check to see if the leading "%" was escaped.
* And because the "Escape any unescaped percents" RegEx used "[sdF]" in its
* negative lookahead assertion, when there was an odd number of "%", it added
* an extra "%", to give the fully escaped "%%%%f" (not a placeholder).
*/
$s = $split_query[ $key - 2 ] . $split_query[ $key - 1 ];
$k = 1;
$l = strlen( $s );
while ( $k <= $l && '%' === $s[ $l - $k ] ) {
++$k;
}
$placeholder = '%' . ( $k % 2 ? '%' : '' ) . $format . $type;
--$placeholder_count;
} else {
// Force floats to be locale-unaware.
if ( 'f' === $type ) {
$type = 'F';
$placeholder = '%' . $format . $type;
}
if ( 'i' === $type ) {
$placeholder = '`%' . $format . 's`';
// Using a simple strpos() due to previous checking (e.g. $allowed_format).
$argnum_pos = strpos( $format, '$' );
if ( false !== $argnum_pos ) {
// sprintf() argnum starts at 1, $arg_id from 0.
$arg_identifiers[] = ( ( (int) substr( $format, 0, $argnum_pos ) ) - 1 );
} else {
$arg_identifiers[] = $arg_id;
}
} elseif ( 'd' !== $type && 'F' !== $type ) {
/*
* i.e. ( 's' === $type ), where 'd' and 'F' keeps $placeholder unchanged,
* and we ensure string escaping is used as a safe default (e.g. even if 'x').
*/
$argnum_pos = strpos( $format, '$' );
if ( false !== $argnum_pos ) {
$arg_strings[] = ( ( (int) substr( $format, 0, $argnum_pos ) ) - 1 );
} else {
$arg_strings[] = $arg_id;
}
/*
* Unquoted strings for backward compatibility (dangerous).
* First, "numbered or formatted string placeholders (eg, %1$s, %5s)".
* Second, if "%s" has a "%" before it, even if it's unrelated (e.g. "LIKE '%%%s%%'").
*/
if ( true !== $this->allow_unsafe_unquoted_parameters
/*
* Note: str_ends_with() is not used here, as this file can be included
* directly outside of WordPress core, e.g. by HyperDB, in which case
* the polyfills from wp-includes/compat.php are not loaded.
*/
|| ( '' === $format && '%' !== substr( $split_query[ $key - 1 ], -1, 1 ) )
) {
$placeholder = "'%" . $format . "s'";
}
}
}
// Glue (-2), any leading characters (-1), then the new $placeholder.
$new_query .= $split_query[ $key - 2 ] . $split_query[ $key - 1 ] . $placeholder;
$key += 3;
++$arg_id;
}
// Replace $query; and add remaining $query characters, or index 0 if there were no placeholders.
$query = $new_query . $split_query[ $key - 2 ];
$dual_use = array_intersect( $arg_identifiers, $arg_strings );
if ( count( $dual_use ) > 0 ) {
wp_load_translations_early();
$used_placeholders = array();
$key = 2;
$arg_id = 0;
// Parse again (only used when there is an error).
while ( $key < $split_query_count ) {
$placeholder = $split_query[ $key ];
$format = substr( $placeholder, 1, -1 );
$argnum_pos = strpos( $format, '$' );
if ( false !== $argnum_pos ) {
$arg_pos = ( ( (int) substr( $format, 0, $argnum_pos ) ) - 1 );
} else {
$arg_pos = $arg_id;
}
$used_placeholders[ $arg_pos ][] = $placeholder;
$key += 3;
++$arg_id;
}
$conflicts = array();
foreach ( $dual_use as $arg_pos ) {
$conflicts[] = implode( ' and ', $used_placeholders[ $arg_pos ] );
}
_doing_it_wrong(
'wpdb::prepare',
sprintf(
/* translators: %s: A list of placeholders found to be a problem. */
__( 'Arguments cannot be prepared as both an Identifier and Value. Found the following conflicts: %s' ),
implode( ', ', $conflicts )
),
'6.2.0'
);
return null;
}
$args_count = count( $args );
if ( $args_count !== $placeholder_count ) {
if ( 1 === $placeholder_count && $passed_as_array ) {
/*
* If the passed query only expected one argument,
* but the wrong number of arguments was sent as an array, bail.
*/
wp_load_translations_early();
_doing_it_wrong(
'wpdb::prepare',
__( 'The query only expected one placeholder, but an array of multiple placeholders was sent.' ),
'4.9.0'
);
return null;
} else {
/*
* If we don't have the right number of placeholders,
* but they were passed as individual arguments,
* or we were expecting multiple arguments in an array, throw a warning.
*/
wp_load_translations_early();
_doing_it_wrong(
'wpdb::prepare',
sprintf(
/* translators: 1: Number of placeholders, 2: Number of arguments passed. */
__( 'The query does not contain the correct number of placeholders (%1$d) for the number of arguments passed (%2$d).' ),
$placeholder_count,
$args_count
),
'4.8.3'
);
/*
* If we don't have enough arguments to match the placeholders,
* return an empty string to avoid a fatal error on PHP 8.
*/
if ( $args_count < $placeholder_count ) {
$max_numbered_placeholder = 0;
for ( $i = 2, $l = $split_query_count; $i < $l; $i += 3 ) {
// Assume a leading number is for a numbered placeholder, e.g. '%3$s'.
$argnum = (int) substr( $split_query[ $i ], 1 );
if ( $max_numbered_placeholder < $argnum ) {
$max_numbered_placeholder = $argnum;
}
}
if ( ! $max_numbered_placeholder || $args_count < $max_numbered_placeholder ) {
return '';
}
}
}
}
$args_escaped = array();
foreach ( $args as $i => $value ) {
if ( in_array( $i, $arg_identifiers, true ) ) {
$args_escaped[] = $this->_escape_identifier_value( $value );
} elseif ( is_int( $value ) || is_float( $value ) ) {
$args_escaped[] = $value;
} else {
if ( ! is_scalar( $value ) && ! is_null( $value ) ) {
wp_load_translations_early();
_doing_it_wrong(
'wpdb::prepare',
sprintf(
/* translators: %s: Value type. */
__( 'Unsupported value type (%s).' ),
gettype( $value )
),
'4.8.2'
);
// Preserving old behavior, where values are escaped as strings.
$value = '';
}
$args_escaped[] = $this->_real_escape( $value );
}
}
$query = vsprintf( $query, $args_escaped );
return $this->add_placeholder_escape( $query );
}
/**
* First half of escaping for `LIKE` special characters `%` and `_` before preparing for SQL.
*
* Use this only before wpdb::prepare() or esc_sql(). Reversing the order is very bad for security.
*
* Example Prepared Statement:
*
* $wild = '%';
* $find = 'only 43% of planets';
* $like = $wild . $wpdb->esc_like( $find ) . $wild;
* $sql = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_content LIKE %s", $like );
*
* Example Escape Chain:
*
* $sql = esc_sql( $wpdb->esc_like( $input ) );
*
* @since 4.0.0
*
* @param string $text The raw text to be escaped. The input typed by the user
* should have no extra or deleted slashes.
* @return string Text in the form of a LIKE phrase. The output is not SQL safe.
* Call wpdb::prepare() or wpdb::_real_escape() next.
*/
public function esc_like( $text ) {
return addcslashes( $text, '_%\\' );
}
/**
* Prints SQL/DB error.
*
* @since 0.71
*
* @global array $EZSQL_ERROR Stores error information of query and error string.
*
* @param string $str The error to display.
* @return null|false Null if the showing of errors is enabled, false if disabled.
*/
public function print_error( $str = '' ) {
global $EZSQL_ERROR;
if ( ! $str ) {
$str = mysqli_error( $this->dbh );
}
$EZSQL_ERROR[] = array(
'query' => $this->last_query,
'error_str' => $str,
);
if ( $this->suppress_errors ) {
return false;
}
$caller = $this->get_caller();
if ( $caller ) {
// Not translated, as this will only appear in the error log.
$error_str = sprintf( 'WordPress database error %1$s for query %2$s made by %3$s', $str, $this->last_query, $caller );
} else {
$error_str = sprintf( 'WordPress database error %1$s for query %2$s', $str, $this->last_query );
}
error_log( $error_str );
// Are we showing errors?
if ( ! $this->show_errors ) {
return false;
}
wp_load_translations_early();
// If there is an error then take note of it.
if ( is_multisite() ) {
$msg = sprintf(
"%s [%s]\n%s\n",
__( 'WordPress database error:' ),
$str,
$this->last_query
);
if ( defined( 'ERRORLOGFILE' ) ) {
error_log( $msg, 3, ERRORLOGFILE );
}
if ( defined( 'DIEONDBERROR' ) ) {
wp_die( $msg );
}
} else {
$str = htmlspecialchars( $str, ENT_QUOTES );
$query = htmlspecialchars( $this->last_query, ENT_QUOTES );
printf(
'',
__( 'WordPress database error:' ),
$str,
$query
);
}
return null;
}
/**
* Enables showing of database errors.
*
* This function should be used only to enable showing of errors.
* wpdb::hide_errors() should be used instead for hiding errors.
*
* @since 0.71
*
* @see wpdb::hide_errors()
*
* @param bool $show Optional. Whether to show errors. Default true.
* @return bool Whether showing of errors was previously active.
*/
public function show_errors( $show = true ) {
$errors = $this->show_errors;
$this->show_errors = $show;
return $errors;
}
/**
* Disables showing of database errors.
*
* By default database errors are not shown.
*
* @since 0.71
*
* @see wpdb::show_errors()
*
* @return bool Whether showing of errors was previously active.
*/
public function hide_errors() {
$show = $this->show_errors;
$this->show_errors = false;
return $show;
}
/**
* Enables or disables suppressing of database errors.
*
* By default database errors are suppressed.
*
* @since 2.5.0
*
* @see wpdb::hide_errors()
*
* @param bool $suppress Optional. Whether to suppress errors. Default true.
* @return bool Whether suppressing of errors was previously active.
*/
public function suppress_errors( $suppress = true ) {
$errors = $this->suppress_errors;
$this->suppress_errors = (bool) $suppress;
return $errors;
}
/**
* Kills cached query results.
*
* @since 0.71
*/
public function flush() {
$this->last_result = array();
$this->col_info = null;
$this->last_query = null;
$this->rows_affected = 0;
$this->num_rows = 0;
$this->last_error = '';
if ( $this->result instanceof mysqli_result ) {
mysqli_free_result( $this->result );
$this->result = null;
// Confidence check before using the handle.
if ( empty( $this->dbh ) || ! ( $this->dbh instanceof mysqli ) ) {
return;
}
// Clear out any results from a multi-query.
while ( mysqli_more_results( $this->dbh ) ) {
mysqli_next_result( $this->dbh );
}
}
}
/**
* Connects to and selects database.
*
* If `$allow_bail` is false, the lack of database connection will need to be handled manually.
*
* @since 3.0.0
* @since 3.9.0 $allow_bail parameter added.
*
* @param bool $allow_bail Optional. Allows the function to bail. Default true.
* @return bool True with a successful connection, false on failure.
*/
public function db_connect( $allow_bail = true ) {
$this->is_mysql = true;
$client_flags = defined( 'MYSQL_CLIENT_FLAGS' ) ? MYSQL_CLIENT_FLAGS : 0;
/*
* Switch error reporting off because WordPress handles its own.
* This is due to the default value change from `MYSQLI_REPORT_OFF`
* to `MYSQLI_REPORT_ERROR|MYSQLI_REPORT_STRICT` in PHP 8.1.
*/
mysqli_report( MYSQLI_REPORT_OFF );
$this->dbh = mysqli_init();
$host = $this->dbhost;
$port = null;
$socket = null;
$is_ipv6 = false;
$host_data = $this->parse_db_host( $this->dbhost );
if ( $host_data ) {
list( $host, $port, $socket, $is_ipv6 ) = $host_data;
}
/*
* If using the `mysqlnd` library, the IPv6 address needs to be enclosed
* in square brackets, whereas it doesn't while using the `libmysqlclient` library.
* @see https://bugs.php.net/bug.php?id=67563
*/
if ( $is_ipv6 && extension_loaded( 'mysqlnd' ) ) {
$host = "[$host]";
}
if ( WP_DEBUG ) {
mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
} else {
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
@mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
}
if ( $this->dbh->connect_errno ) {
$this->dbh = null;
}
if ( ! $this->dbh && $allow_bail ) {
wp_load_translations_early();
// Load custom DB error template, if present.
if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
require_once WP_CONTENT_DIR . '/db-error.php';
die();
}
$message = '' . __( 'Error establishing a database connection' ) . "
\n";
$message .= '' . sprintf(
/* translators: 1: wp-config.php, 2: Database host. */
__( 'This either means that the username and password information in your %1$s file is incorrect or that contact with the database server at %2$s could not be established. This could mean your host’s database server is down.' ),
'wp-config.php',
'' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . ''
) . "
\n";
$message .= "\n";
$message .= '- ' . __( 'Are you sure you have the correct username and password?' ) . "
\n";
$message .= '- ' . __( 'Are you sure you have typed the correct hostname?' ) . "
\n";
$message .= '- ' . __( 'Are you sure the database server is running?' ) . "
\n";
$message .= "
\n";
$message .= '' . sprintf(
/* translators: %s: Support forums URL. */
__( 'If you are unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress support forums.' ),
__( 'https://wordpress.org/support/forums/' )
) . "
\n";
$this->bail( $message, 'db_connect_fail' );
return false;
} elseif ( $this->dbh ) {
if ( ! $this->has_connected ) {
$this->init_charset();
}
$this->has_connected = true;
$this->set_charset( $this->dbh );
$this->ready = true;
$this->set_sql_mode();
$this->select( $this->dbname, $this->dbh );
return true;
}
return false;
}
/**
* Parses the DB_HOST setting to interpret it for mysqli_real_connect().
*
* mysqli_real_connect() doesn't support the host param including a port or socket
* like mysql_connect() does. This duplicates how mysql_connect() detects a port
* and/or socket file.
*
* @since 4.9.0
*
* @param string $host The DB_HOST setting to parse.
* @return array|false {
* Array containing the host, the port, the socket and
* whether it is an IPv6 address, in that order.
* False if the host couldn't be parsed.
*
* @type string $0 Host name.
* @type string|null $1 Port.
* @type string|null $2 Socket.
* @type bool $3 Whether it is an IPv6 address.
* }
*/
public function parse_db_host( $host ) {
$socket = null;
$is_ipv6 = false;
// First peel off the socket parameter from the right, if it exists.
$socket_pos = strpos( $host, ':/' );
if ( false !== $socket_pos ) {
$socket = substr( $host, $socket_pos + 1 );
$host = substr( $host, 0, $socket_pos );
}
/*
* We need to check for an IPv6 address first.
* An IPv6 address will always contain at least two colons.
*/
if ( substr_count( $host, ':' ) > 1 ) {
$pattern = '#^(?:\[)?(?P[0-9a-fA-F:]+)(?:\]:(?P[\d]+))?#';
$is_ipv6 = true;
} else {
// We seem to be dealing with an IPv4 address.
$pattern = '#^(?P[^:/]*)(?::(?P[\d]+))?#';
}
$matches = array();
$result = preg_match( $pattern, $host, $matches );
if ( 1 !== $result ) {
// Couldn't parse the address, bail.
return false;
}
$host = ! empty( $matches['host'] ) ? $matches['host'] : '';
// Port cannot be a string; must be null or an integer.
$port = ! empty( $matches['port'] ) ? absint( $matches['port'] ) : null;
return array( $host, $port, $socket, $is_ipv6 );
}
/**
* Checks that the connection to the database is still up. If not, try to reconnect.
*
* If this function is unable to reconnect, it will forcibly die, or if called
* after the {@see 'template_redirect'} hook has been fired, return false instead.
*
* If `$allow_bail` is false, the lack of database connection will need to be handled manually.
*
* @since 3.9.0
*
* @param bool $allow_bail Optional. Allows the function to bail. Default true.
* @return bool Whether the connection is up. Exits if down and $allow_bail is true.
*/
public function check_connection( $allow_bail = true ) {
// Check if the connection is alive.
if ( ! empty( $this->dbh ) && mysqli_query( $this->dbh, 'DO 1' ) !== false ) {
return true;
}
$error_reporting = false;
// Disable warnings, as we don't want to see a multitude of "unable to connect" messages.
if ( WP_DEBUG ) {
$error_reporting = error_reporting();
error_reporting( $error_reporting & ~E_WARNING );
}
for ( $tries = 1; $tries <= $this->reconnect_retries; $tries++ ) {
/*
* On the last try, re-enable warnings. We want to see a single instance
* of the "unable to connect" message on the bail() screen, if it appears.
*/
if ( $this->reconnect_retries === $tries && WP_DEBUG ) {
error_reporting( $error_reporting );
}
if ( $this->db_connect( false ) ) {
if ( $error_reporting ) {
error_reporting( $error_reporting );
}
return true;
}
sleep( 1 );
}
/*
* If template_redirect has already happened, it's too late for wp_die()/dead_db().
* Let's just return and hope for the best.
*/
if ( did_action( 'template_redirect' ) ) {
return false;
}
if ( ! $allow_bail ) {
return false;
}
wp_load_translations_early();
$message = '' . __( 'Error reconnecting to the database' ) . "
\n";
$message .= '' . sprintf(
/* translators: %s: Database host. */
__( 'This means that the contact with the database server at %s was lost. This could mean your host’s database server is down.' ),
'' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . ''
) . "
\n";
$message .= "\n";
$message .= '- ' . __( 'Are you sure the database server is running?' ) . "
\n";
$message .= '- ' . __( 'Are you sure the database server is not under particularly heavy load?' ) . "
\n";
$message .= "
\n";
$message .= '' . sprintf(
/* translators: %s: Support forums URL. */
__( 'If you are unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress support forums.' ),
__( 'https://wordpress.org/support/forums/' )
) . "
\n";
// We weren't able to reconnect, so we better bail.
$this->bail( $message, 'db_connect_fail' );
/*
* Call dead_db() if bail didn't die, because this database is no more.
* It has ceased to be (at least temporarily).
*/
dead_db();
}
/**
* Performs a database query, using current database connection.
*
* More information can be found on the documentation page.
*
* @since 0.71
*
* @link https://developer.wordpress.org/reference/classes/wpdb/
*
* @param string $query Database query.
* @return int|bool Boolean true for CREATE, ALTER, TRUNCATE and DROP queries. Number of rows
* affected/selected for all other queries. Boolean false on error.
*/
public function query( $query ) {
if ( ! $this->ready ) {
$this->check_current_query = true;
return false;
}
/**
* Filters the database query.
*
* Some queries are made before the plugins have been loaded,
* and thus cannot be filtered with this method.
*
* @since 2.1.0
*
* @param string $query Database query.
*/
$query = apply_filters( 'query', $query );
if ( ! $query ) {
$this->insert_id = 0;
return false;
}
$this->flush();
// Log how the function was called.
$this->func_call = "\$db->query(\"$query\")";
// If we're writing to the database, make sure the query will write safely.
if ( $this->check_current_query && ! $this->check_ascii( $query ) ) {
$stripped_query = $this->strip_invalid_text_from_query( $query );
/*
* strip_invalid_text_from_query() can perform queries, so we need
* to flush again, just to make sure everything is clear.
*/
$this->flush();
if ( $stripped_query !== $query ) {
$this->insert_id = 0;
$this->last_query = $query;
wp_load_translations_early();
$this->last_error = __( 'WordPress database error: Could not perform query because it contains invalid data.' );
return false;
}
}
$this->check_current_query = true;
// Keep track of the last query for debug.
$this->last_query = $query;
$this->_do_query( $query );
// Database server has gone away, try to reconnect.
$mysql_errno = 0;
if ( $this->dbh instanceof mysqli ) {
$mysql_errno = mysqli_errno( $this->dbh );
} else {
/*
* $dbh is defined, but isn't a real connection.
* Something has gone horribly wrong, let's try a reconnect.
*/
$mysql_errno = 2006;
}
if ( empty( $this->dbh ) || 2006 === $mysql_errno ) {
if ( $this->check_connection() ) {
$this->_do_query( $query );
} else {
$this->insert_id = 0;
return false;
}
}
// If there is an error then take note of it.
if ( $this->dbh instanceof mysqli ) {
$this->last_error = mysqli_error( $this->dbh );
} else {
$this->last_error = __( 'Unable to retrieve the error message from the database server' );
}
if ( $this->last_error ) {
// Clear insert_id on a subsequent failed insert.
if ( $this->insert_id && preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
$this->insert_id = 0;
}
$this->print_error();
return false;
}
if ( preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) {
$return_val = $this->result;
} elseif ( preg_match( '/^\s*(insert|delete|update|replace)\s/i', $query ) ) {
$this->rows_affected = mysqli_affected_rows( $this->dbh );
// Take note of the insert_id.
if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
$this->insert_id = mysqli_insert_id( $this->dbh );
}
// Return number of rows affected.
$return_val = $this->rows_affected;
} else {
$num_rows = 0;
if ( $this->result instanceof mysqli_result ) {
while ( $row = mysqli_fetch_object( $this->result ) ) {
$this->last_result[ $num_rows ] = $row;
++$num_rows;
}
}
// Log and return the number of rows selected.
$this->num_rows = $num_rows;
$return_val = $num_rows;
}
return $return_val;
}
/**
* Internal function to perform the mysqli_query() call.
*
* @since 3.9.0
*
* @see wpdb::query()
*
* @param string $query The query to run.
*/
private function _do_query( $query ) {
if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
$this->timer_start();
}
if ( ! empty( $this->dbh ) ) {
$this->result = mysqli_query( $this->dbh, $query );
}
++$this->num_queries;
if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
$this->log_query(
$query,
$this->timer_stop(),
$this->get_caller(),
$this->time_start,
array()
);
}
}
/**
* Logs query data.
*
* @since 5.3.0
*
* @param string $query The query's SQL.
* @param float $query_time Total time spent on the query, in seconds.
* @param string $query_callstack Comma-separated list of the calling functions.
* @param float $query_start Unix timestamp of the time at the start of the query.
* @param array $query_data Custom query data.
*/
public function log_query( $query, $query_time, $query_callstack, $query_start, $query_data ) {
/**
* Filters the custom data to log alongside a query.
*
* Caution should be used when modifying any of this data, it is recommended that any additional
* information you need to store about a query be added as a new associative array element.
*
* @since 5.3.0
*
* @param array $query_data Custom query data.
* @param string $query The query's SQL.
* @param float $query_time Total time spent on the query, in seconds.
* @param string $query_callstack Comma-separated list of the calling functions.
* @param float $query_start Unix timestamp of the time at the start of the query.
*/
$query_data = apply_filters( 'log_query_custom_data', $query_data, $query, $query_time, $query_callstack, $query_start );
$this->queries[] = array(
$query,
$query_time,
$query_callstack,
$query_start,
$query_data,
);
}
/**
* Generates and returns a placeholder escape string for use in queries returned by ::prepare().
*
* @since 4.8.3
*
* @return string String to escape placeholders.
*/
public function placeholder_escape() {
static $placeholder;
if ( ! $placeholder ) {
// Old WP installs may not have AUTH_SALT defined.
$salt = defined( 'AUTH_SALT' ) && AUTH_SALT ? AUTH_SALT : (string) rand();
$placeholder = '{' . hash_hmac( 'sha256', uniqid( $salt, true ), $salt ) . '}';
}
/*
* Add the filter to remove the placeholder escaper. Uses priority 0, so that anything
* else attached to this filter will receive the query with the placeholder string removed.
*/
if ( false === has_filter( 'query', array( $this, 'remove_placeholder_escape' ) ) ) {
add_filter( 'query', array( $this, 'remove_placeholder_escape' ), 0 );
}
return $placeholder;
}
/**
* Adds a placeholder escape string, to escape anything that resembles a printf() placeholder.
*
* @since 4.8.3
*
* @param string $query The query to escape.
* @return string The query with the placeholder escape string inserted where necessary.
*/
public function add_placeholder_escape( $query ) {
/*
* To prevent returning anything that even vaguely resembles a placeholder,
* we clobber every % we can find.
*/
return str_replace( '%', $this->placeholder_escape(), $query );
}
/**
* Removes the placeholder escape strings from a query.
*
* @since 4.8.3
*
* @param string $query The query from which the placeholder will be removed.
* @return string The query with the placeholder removed.
*/
public function remove_placeholder_escape( $query ) {
return str_replace( $this->placeholder_escape(), '%', $query );
}
/**
* Inserts a row into the table.
*
* Examples:
*
* $wpdb->insert(
* 'table',
* array(
* 'column1' => 'foo',
* 'column2' => 'bar',
* )
* );
* $wpdb->insert(
* 'table',
* array(
* 'column1' => 'foo',
* 'column2' => 1337,
* ),
* array(
* '%s',
* '%d',
* )
* );
*
* @since 2.5.0
*
* @see wpdb::prepare()
* @see wpdb::$field_types
* @see wp_set_wpdb_vars()
*
* @param string $table Table name.
* @param array $data Data to insert (in column => value pairs).
* Both `$data` columns and `$data` values should be "raw" (neither should be SQL escaped).
* Sending a null value will cause the column to be set to NULL - the corresponding
* format is ignored in this case.
* @param string[]|string $format Optional. An array of formats to be mapped to each of the value in `$data`.
* If string, that format will be used for all of the values in `$data`.
* A format is one of '%d', '%f', '%s' (integer, float, string).
* If omitted, all values in `$data` will be treated as strings unless otherwise
* specified in wpdb::$field_types. Default null.
* @return int|false The number of rows inserted, or false on error.
*/
public function insert( $table, $data, $format = null ) {
return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' );
}
/**
* Replaces a row in the table or inserts it if it does not exist, based on a PRIMARY KEY or a UNIQUE index.
*
* A REPLACE works exactly like an INSERT, except that if an old row in the table has the same value as a new row
* for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is inserted.
*
* Examples:
*
* $wpdb->replace(
* 'table',
* array(
* 'ID' => 123,
* 'column1' => 'foo',
* 'column2' => 'bar',
* )
* );
* $wpdb->replace(
* 'table',
* array(
* 'ID' => 456,
* 'column1' => 'foo',
* 'column2' => 1337,
* ),
* array(
* '%d',
* '%s',
* '%d',
* )
* );
*
* @since 3.0.0
*
* @see wpdb::prepare()
* @see wpdb::$field_types
* @see wp_set_wpdb_vars()
*
* @param string $table Table name.
* @param array $data Data to insert (in column => value pairs).
* Both `$data` columns and `$data` values should be "raw" (neither should be SQL escaped).
* A primary key or unique index is required to perform a replace operation.
* Sending a null value will cause the column to be set to NULL - the corresponding
* format is ignored in this case.
* @param string[]|string $format Optional. An array of formats to be mapped to each of the value in `$data`.
* If string, that format will be used for all of the values in `$data`.
* A format is one of '%d', '%f', '%s' (integer, float, string).
* If omitted, all values in `$data` will be treated as strings unless otherwise
* specified in wpdb::$field_types. Default null.
* @return int|false The number of rows affected, or false on error.
*/
public function replace( $table, $data, $format = null ) {
return $this->_insert_replace_helper( $table, $data, $format, 'REPLACE' );
}
/**
* Helper function for insert and replace.
*
* Runs an insert or replace query based on `$type` argument.
*
* @since 3.0.0
*
* @see wpdb::prepare()
* @see wpdb::$field_types
* @see wp_set_wpdb_vars()
*
* @param string $table Table name.
* @param array $data Data to insert (in column => value pairs).
* Both `$data` columns and `$data` values should be "raw" (neither should be SQL escaped).
* Sending a null value will cause the column to be set to NULL - the corresponding
* format is ignored in this case.
* @param string[]|string $format Optional. An array of formats to be mapped to each of the value in `$data`.
* If string, that format will be used for all of the values in `$data`.
* A format is one of '%d', '%f', '%s' (integer, float, string).
* If omitted, all values in `$data` will be treated as strings unless otherwise
* specified in wpdb::$field_types. Default null.
* @param string $type Optional. Type of operation. Either 'INSERT' or 'REPLACE'.
* Default 'INSERT'.
* @return int|false The number of rows affected, or false on error.
*/
public function _insert_replace_helper( $table, $data, $format = null, $type = 'INSERT' ) {
$this->insert_id = 0;
if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ), true ) ) {
return false;
}
$data = $this->process_fields( $table, $data, $format );
if ( false === $data ) {
return false;
}
$formats = array();
$values = array();
foreach ( $data as $value ) {
if ( is_null( $value['value'] ) ) {
$formats[] = 'NULL';
continue;
}
$formats[] = $value['format'];
$values[] = $value['value'];
}
$fields = '`' . implode( '`, `', array_keys( $data ) ) . '`';
$formats = implode( ', ', $formats );
$sql = "$type INTO `$table` ($fields) VALUES ($formats)";
$this->check_current_query = false;
return $this->query( $this->prepare( $sql, $values ) );
}
/**
* Updates a row in the table.
*
* Examples:
*
* $wpdb->update(
* 'table',
* array(
* 'column1' => 'foo',
* 'column2' => 'bar',
* ),
* array(
* 'ID' => 1,
* )
* );
* $wpdb->update(
* 'table',
* array(
* 'column1' => 'foo',
* 'column2' => 1337,
* ),
* array(
* 'ID' => 1,
* ),
* array(
* '%s',
* '%d',
* ),
* array(
* '%d',
* )
* );
*
* @since 2.5.0
*
* @see wpdb::prepare()
* @see wpdb::$field_types
* @see wp_set_wpdb_vars()
*
* @param string $table Table name.
* @param array $data Data to update (in column => value pairs).
* Both $data columns and $data values should be "raw" (neither should be SQL escaped).
* Sending a null value will cause the column to be set to NULL - the corresponding
* format is ignored in this case.
* @param array $where A named array of WHERE clauses (in column => value pairs).
* Multiple clauses will be joined with ANDs.
* Both $where columns and $where values should be "raw".
* Sending a null value will create an IS NULL comparison - the corresponding
* format will be ignored in this case.
* @param string[]|string $format Optional. An array of formats to be mapped to each of the values in $data.
* If string, that format will be used for all of the values in $data.
* A format is one of '%d', '%f', '%s' (integer, float, string).
* If omitted, all values in $data will be treated as strings unless otherwise
* specified in wpdb::$field_types. Default null.
* @param string[]|string $where_format Optional. An array of formats to be mapped to each of the values in $where.
* If string, that format will be used for all of the items in $where.
* A format is one of '%d', '%f', '%s' (integer, float, string).
* If omitted, all values in $where will be treated as strings unless otherwise
* specified in wpdb::$field_types. Default null.
* @return int|false The number of rows updated, or false on error.
*/
public function update( $table, $data, $where, $format = null, $where_format = null ) {
if ( ! is_array( $data ) || ! is_array( $where ) ) {
return false;
}
$data = $this->process_fields( $table, $data, $format );
if ( false === $data ) {
return false;
}
$where = $this->process_fields( $table, $where, $where_format );
if ( false === $where ) {
return false;
}
$fields = array();
$conditions = array();
$values = array();
foreach ( $data as $field => $value ) {
if ( is_null( $value['value'] ) ) {
$fields[] = "`$field` = NULL";
continue;
}
$fields[] = "`$field` = " . $value['format'];
$values[] = $value['value'];
}
foreach ( $where as $field => $value ) {
if ( is_null( $value['value'] ) ) {
$conditions[] = "`$field` IS NULL";
continue;
}
$conditions[] = "`$field` = " . $value['format'];
$values[] = $value['value'];
}
$fields = implode( ', ', $fields );
$conditions = implode( ' AND ', $conditions );
$sql = "UPDATE `$table` SET $fields WHERE $conditions";
$this->check_current_query = false;
return $this->query( $this->prepare( $sql, $values ) );
}
/**
* Deletes a row in the table.
*
* Examples:
*
* $wpdb->delete(
* 'table',
* array(
* 'ID' => 1,
* )
* );
* $wpdb->delete(
* 'table',
* array(
* 'ID' => 1,
* ),
* array(
* '%d',
* )
* );
*
* @since 3.4.0
*
* @see wpdb::prepare()
* @see wpdb::$field_types
* @see wp_set_wpdb_vars()
*
* @param string $table Table name.
* @param array $where A named array of WHERE clauses (in column => value pairs).
* Multiple clauses will be joined with ANDs.
* Both $where columns and $where values should be "raw".
* Sending a null value will create an IS NULL comparison - the corresponding
* format will be ignored in this case.
* @param string[]|string $where_format Optional. An array of formats to be mapped to each of the values in $where.
* If string, that format will be used for all of the items in $where.
* A format is one of '%d', '%f', '%s' (integer, float, string).
* If omitted, all values in $where will be treated as strings unless otherwise
* specified in wpdb::$field_types. Default null.
* @return int|false The number of rows deleted, or false on error.
*/
public function delete( $table, $where, $where_format = null ) {
if ( ! is_array( $where ) ) {
return false;
}
$where = $this->process_fields( $table, $where, $where_format );
if ( false === $where ) {
return false;
}
$conditions = array();
$values = array();
foreach ( $where as $field => $value ) {
if ( is_null( $value['value'] ) ) {
$conditions[] = "`$field` IS NULL";
continue;
}
$conditions[] = "`$field` = " . $value['format'];
$values[] = $value['value'];
}
$conditions = implode( ' AND ', $conditions );
$sql = "DELETE FROM `$table` WHERE $conditions";
$this->check_current_query = false;
return $this->query( $this->prepare( $sql, $values ) );
}
/**
* Processes arrays of field/value pairs and field formats.
*
* This is a helper method for wpdb's CRUD methods, which take field/value pairs
* for inserts, updates, and where clauses. This method first pairs each value
* with a format. Then it determines the charset of that field, using that
* to determine if any invalid text would be stripped. If text is stripped,
* then field processing is rejected and the query fails.
*
* @since 4.2.0
*
* @param string $table Table name.
* @param array $data Array of values keyed by their field names.
* @param string[]|string $format Formats or format to be mapped to the values in the data.
* @return array|false An array of fields that contain paired value and formats.
* False for invalid values.
*/
protected function process_fields( $table, $data, $format ) {
$data = $this->process_field_formats( $data, $format );
if ( false === $data ) {
return false;
}
$data = $this->process_field_charsets( $data, $table );
if ( false === $data ) {
return false;
}
$data = $this->process_field_lengths( $data, $table );
if ( false === $data ) {
return false;
}
$converted_data = $this->strip_invalid_text( $data );
if ( $data !== $converted_data ) {
$problem_fields = array();
foreach ( $data as $field => $value ) {
if ( $value !== $converted_data[ $field ] ) {
$problem_fields[] = $field;
}
}
wp_load_translations_early();
if ( 1 === count( $problem_fields ) ) {
$this->last_error = sprintf(
/* translators: %s: Database field where the error occurred. */
__( 'WordPress database error: Processing the value for the following field failed: %s. The supplied value may be too long or contains invalid data.' ),
reset( $problem_fields )
);
} else {
$this->last_error = sprintf(
/* translators: %s: Database fields where the error occurred. */
__( 'WordPress database error: Processing the values for the following fields failed: %s. The supplied values may be too long or contain invalid data.' ),
implode( ', ', $problem_fields )
);
}
return false;
}
return $data;
}
/**
* Prepares arrays of value/format pairs as passed to wpdb CRUD methods.
*
* @since 4.2.0
*
* @param array $data Array of values keyed by their field names.
* @param string[]|string $format Formats or format to be mapped to the values in the data.
* @return array {
* Array of values and formats keyed by their field names.
*
* @type array ...$0 {
* Value and format for this field.
*
* @type mixed $value The value to be formatted.
* @type string $format The format to be mapped to the value.
* }
* }
*/
protected function process_field_formats( $data, $format ) {
$formats = (array) $format;
$original_formats = $formats;
foreach ( $data as $field => $value ) {
$value = array(
'value' => $value,
'format' => '%s',
);
if ( ! empty( $format ) ) {
$value['format'] = array_shift( $formats );
if ( ! $value['format'] ) {
$value['format'] = reset( $original_formats );
}
} elseif ( isset( $this->field_types[ $field ] ) ) {
$value['format'] = $this->field_types[ $field ];
}
$data[ $field ] = $value;
}
return $data;
}
/**
* Adds field charsets to field/value/format arrays generated by wpdb::process_field_formats().
*
* @since 4.2.0
*
* @param array $data {
* Array of values and formats keyed by their field names,
* as it comes from the wpdb::process_field_formats() method.
*
* @type array ...$0 {
* Value and format for this field.
*
* @type mixed $value The value to be formatted.
* @type string $format The format to be mapped to the value.
* }
* }
* @param string $table Table name.
* @return array|false {
* The same array of data with additional 'charset' keys, or false if
* the charset for the table cannot be found.
*
* @type array ...$0 {
* Value, format, and charset for this field.
*
* @type mixed $value The value to be formatted.
* @type string $format The format to be mapped to the value.
* @type string|false $charset The charset to be used for the value.
* }
* }
*/
protected function process_field_charsets( $data, $table ) {
foreach ( $data as $field => $value ) {
if ( '%d' === $value['format'] || '%f' === $value['format'] ) {
/*
* We can skip this field if we know it isn't a string.
* This checks %d/%f versus ! %s because its sprintf() could take more.
*/
$value['charset'] = false;
} else {
$value['charset'] = $this->get_col_charset( $table, $field );
if ( is_wp_error( $value['charset'] ) ) {
return false;
}
}
$data[ $field ] = $value;
}
return $data;
}
/**
* For string fields, records the maximum string length that field can safely save.
*
* @since 4.2.1
*
* @param array $data {
* Array of values, formats, and charsets keyed by their field names,
* as it comes from the wpdb::process_field_charsets() method.
*
* @type array ...$0 {
* Value, format, and charset for this field.
*
* @type mixed $value The value to be formatted.
* @type string $format The format to be mapped to the value.
* @type string|false $charset The charset to be used for the value.
* }
* }
* @param string $table Table name.
* @return array|false {
* The same array of data with additional 'length' keys, or false if
* information for the table cannot be found.
*
* @type array ...$0 {
* Value, format, charset, and length for this field.
*
* @type mixed $value The value to be formatted.
* @type string $format The format to be mapped to the value.
* @type string|false $charset The charset to be used for the value.
* @type array|false $length {
* Information about the maximum length of the value.
* False if the column has no length.
*
* @type string $type One of 'byte' or 'char'.
* @type int $length The column length.
* }
* }
* }
*/
protected function process_field_lengths( $data, $table ) {
foreach ( $data as $field => $value ) {
if ( '%d' === $value['format'] || '%f' === $value['format'] ) {
/*
* We can skip this field if we know it isn't a string.
* This checks %d/%f versus ! %s because its sprintf() could take more.
*/
$value['length'] = false;
} else {
$value['length'] = $this->get_col_length( $table, $field );
if ( is_wp_error( $value['length'] ) ) {
return false;
}
}
$data[ $field ] = $value;
}
return $data;
}
/**
* Retrieves one value from the database.
*
* Executes a SQL query and returns the value from the SQL result.
* If the SQL result contains more than one column and/or more than one row,
* the value in the column and row specified is returned. If $query is null,
* the value in the specified column and row from the previous SQL result is returned.
*
* Returns null both on failure and when the matched cell value is an empty
* string. To distinguish the two cases, check {@see self::$last_error}.
*
* @since 0.71
*
* @param string|null $query Optional. SQL query. Defaults to null, use the result from the previous query.
* @param int $x Optional. Column of value to return. Indexed from 0. Default 0.
* @param int $y Optional. Row of value to return. Indexed from 0. Default 0.
* @return string|null Database query result (as string), or null on failure or when the value is an empty string.
* @phpstan-return non-empty-string|null
*/
public function get_var( $query = null, $x = 0, $y = 0 ) {
$this->func_call = "\$db->get_var(\"$query\", $x, $y)";
if ( $query ) {
if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
$this->query( $query );
}
// Extract var out of cached results based on x,y vals.
if ( ! empty( $this->last_result[ $y ] ) ) {
/**
* Column values.
*
* These are returned from the database as strings, or null for SQL NULL, but get_object_vars() types the
* property values as mixed.
*
* @var list $values
*/
$values = array_values( get_object_vars( $this->last_result[ $y ] ) );
}
// If there is a value return it, else return null.
return ( isset( $values[ $x ] ) && '' !== $values[ $x ] ) ? $values[ $x ] : null;
}
/**
* Retrieves one row from the database.
*
* Executes a SQL query and returns the row from the SQL result.
*
* @since 0.71
*
* @param string|null $query SQL query.
* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
* correspond to an stdClass object, an associative array, or a numeric array,
* respectively. Default OBJECT.
* @param int $y Optional. Row to return. Indexed from 0. Default 0.
* @return array|object|null Database query result in format specified by $output or null on failure.
* @phpstan-param 'OBJECT'|'ARRAY_A'|'ARRAY_N' $output
* @phpstan-return (
* $query is non-falsy-string
* ? (
* $output is 'OBJECT'
* ? stdClass|null
* : (
* $output is 'ARRAY_A'
* ? array|null
* : (
* $output is 'ARRAY_N'
* ? list|null
* : null
* )
* )
* )
* : null
* )
*/
public function get_row( $query = null, $output = OBJECT, $y = 0 ) {
$this->func_call = "\$db->get_row(\"$query\",$output,$y)";
if ( $query ) {
if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
$this->query( $query );
} else {
return null;
}
if ( ! isset( $this->last_result[ $y ] ) ) {
return null;
}
if ( OBJECT === $output ) {
return $this->last_result[ $y ] ? $this->last_result[ $y ] : null;
} elseif ( ARRAY_A === $output ) {
return $this->last_result[ $y ] ? get_object_vars( $this->last_result[ $y ] ) : null;
} elseif ( ARRAY_N === $output ) {
return $this->last_result[ $y ] ? array_values( get_object_vars( $this->last_result[ $y ] ) ) : null;
} elseif ( OBJECT === strtoupper( $output ) ) {
// Back compat for OBJECT being previously case-insensitive.
return $this->last_result[ $y ] ? $this->last_result[ $y ] : null;
} else {
$this->print_error( ' $db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N' );
}
return null;
}
/**
* Retrieves one column from the database.
*
* Executes a SQL query and returns the column from the SQL result.
* If the SQL result contains more than one column, the column specified is returned.
* If $query is null, the specified column from the previous SQL result is returned.
*
* @since 0.71
*
* @param string|null $query Optional. SQL query. Defaults to previous query.
* @param int $x Optional. Column to return. Indexed from 0. Default 0.
* @return array Database query result. Array indexed from 0 by SQL result row number.
* @phpstan-return list
*/
public function get_col( $query = null, $x = 0 ) {
if ( $query ) {
if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
$this->query( $query );
}
$new_array = array();
// Extract the column values.
if ( $this->last_result ) {
for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {
$new_array[] = $this->get_var( null, $x, $i );
}
}
return $new_array;
}
/**
* Retrieves an entire SQL result set from the database (i.e., many rows).
*
* Executes a SQL query and returns the entire SQL result.
*
* Returns an empty array when no rows match or when the database
* reports an error for the query. Returns null when $query is empty,
* when $output is not one of the recognized constants, or when the
* query cannot run because the connection is not ready.
*
* @since 0.71
*
* @param string|null $query SQL query.
* @param string $output Optional. Any of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants.
* With one of the first three, return an array of rows indexed
* from 0 by SQL result row number. Each row is an associative array
* (column => value, ...), a numerically indexed array (0 => value, ...),
* or an object ( ->column = value ), respectively. With OBJECT_K,
* return an associative array of row objects keyed by the value
* of each row's first column's value. Duplicate keys are discarded.
* Default OBJECT.
* @return array|null Database query results. Empty array when no rows match
* or on database error. Null when $query is empty, when
* $output is invalid, or when the connection is not ready.
* @phpstan-param 'OBJECT'|'OBJECT_K'|'ARRAY_A'|'ARRAY_N' $output
* @phpstan-return (
* $query is non-falsy-string
* ? (
* $output is 'OBJECT'
* ? list|null
* : (
* $output is 'OBJECT_K'
* ? array
* : (
* $output is 'ARRAY_A'
* ? list>
* : (
* $output is 'ARRAY_N'
* ? list>
* : null
* )
* )
* )
* )
* : null
* )
*/
public function get_results( $query = null, $output = OBJECT ) {
$this->func_call = "\$db->get_results(\"$query\", $output)";
if ( $query ) {
if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
$this->query( $query );
} else {
return null;
}
$new_array = array();
if ( OBJECT === $output ) {
// Return an integer-keyed array of row objects.
return $this->last_result;
} elseif ( OBJECT_K === $output ) {
/*
* Return an array of row objects with keys from column 1.
* (Duplicates are discarded.)
*/
if ( $this->last_result ) {
foreach ( $this->last_result as $row ) {
$var_by_ref = get_object_vars( $row );
/**
* The first column's value is used as the key.
*
* A SQL NULL value surfaces as null here, so coerce it to an empty string to avoid the deprecated
* use of null as an array offset (PHP 8.5+).
*
* @var array-key $key
*/
$key = array_shift( $var_by_ref ) ?? '';
if ( ! isset( $new_array[ $key ] ) ) {
$new_array[ $key ] = $row;
}
}
}
return $new_array;
} elseif ( ARRAY_A === $output || ARRAY_N === $output ) {
// Return an integer-keyed array of...
if ( $this->last_result ) {
if ( ARRAY_N === $output ) {
foreach ( (array) $this->last_result as $row ) {
// ...integer-keyed row arrays.
$new_array[] = array_values( get_object_vars( $row ) );
}
} else {
foreach ( (array) $this->last_result as $row ) {
// ...column name-keyed row arrays.
$new_array[] = get_object_vars( $row );
}
}
}
return $new_array;
} elseif ( strtoupper( $output ) === OBJECT ) {
// Back compat for OBJECT being previously case-insensitive.
return $this->last_result;
}
return null;
}
/**
* Retrieves the character set for the given table.
*
* @since 4.2.0
*
* @param string $table Table name.
* @return string|WP_Error Table character set, WP_Error object if it couldn't be found.
*/
protected function get_table_charset( $table ) {
$tablekey = strtolower( $table );
/**
* Filters the table charset value before the DB is checked.
*
* Returning a non-null value from the filter will effectively short-circuit
* checking the DB for the charset, returning that value instead.
*
* @since 4.2.0
*
* @param string|WP_Error|null $charset The character set to use, WP_Error object
* if it couldn't be found. Default null.
* @param string $table The name of the table being checked.
*/
$charset = apply_filters( 'pre_get_table_charset', null, $table );
if ( null !== $charset ) {
return $charset;
}
if ( isset( $this->table_charset[ $tablekey ] ) ) {
return $this->table_charset[ $tablekey ];
}
$charsets = array();
$columns = array();
$table_parts = explode( '.', $table );
$table = '`' . implode( '`.`', $table_parts ) . '`';
$results = $this->get_results( "SHOW FULL COLUMNS FROM $table" );
if ( ! $results ) {
return new WP_Error( 'wpdb_get_table_charset_failure', __( 'Could not retrieve table charset.' ) );
}
foreach ( $results as $column ) {
$columns[ strtolower( $column->Field ) ] = $column;
}
$this->col_meta[ $tablekey ] = $columns;
foreach ( $columns as $column ) {
if ( ! empty( $column->Collation ) ) {
list( $charset ) = explode( '_', $column->Collation );
$charsets[ strtolower( $charset ) ] = true;
}
list( $type ) = explode( '(', $column->Type );
// A binary/blob means the whole query gets treated like this.
if ( in_array( strtoupper( $type ), array( 'BINARY', 'VARBINARY', 'TINYBLOB', 'MEDIUMBLOB', 'BLOB', 'LONGBLOB' ), true ) ) {
$this->table_charset[ $tablekey ] = 'binary';
return 'binary';
}
}
// utf8mb3 is an alias for utf8.
if ( isset( $charsets['utf8mb3'] ) ) {
$charsets['utf8'] = true;
unset( $charsets['utf8mb3'] );
}
// Check if we have more than one charset in play.
$count = count( $charsets );
if ( 1 === $count ) {
$charset = key( $charsets );
} elseif ( 0 === $count ) {
// No charsets, assume this table can store whatever.
$charset = false;
} else {
// More than one charset. Remove latin1 if present and recalculate.
unset( $charsets['latin1'] );
$count = count( $charsets );
if ( 1 === $count ) {
// Only one charset (besides latin1).
$charset = key( $charsets );
} elseif ( 2 === $count && isset( $charsets['utf8'], $charsets['utf8mb4'] ) ) {
// Two charsets, but they're utf8 and utf8mb4, use utf8.
$charset = 'utf8';
} else {
// Two mixed character sets. ascii.
$charset = 'ascii';
}
}
$this->table_charset[ $tablekey ] = $charset;
return $charset;
}
/**
* Retrieves the character set for the given column.
*
* @since 4.2.0
*
* @param string $table Table name.
* @param string $column Column name.
* @return string|false|WP_Error Column character set as a string. False if the column has
* no character set. WP_Error object if there was an error.
*/
public function get_col_charset( $table, $column ) {
$tablekey = strtolower( $table );
$columnkey = strtolower( $column );
/**
* Filters the column charset value before the DB is checked.
*
* Passing a non-null value to the filter will short-circuit
* checking the DB for the charset, returning that value instead.
*
* @since 4.2.0
*
* @param string|null|false|WP_Error $charset The character set to use. Default null.
* @param string $table The name of the table being checked.
* @param string $column The name of the column being checked.
*/
$charset = apply_filters( 'pre_get_col_charset', null, $table, $column );
if ( null !== $charset ) {
return $charset;
}
// Skip this entirely if this isn't a MySQL database.
if ( empty( $this->is_mysql ) ) {
return false;
}
if ( empty( $this->table_charset[ $tablekey ] ) ) {
// This primes column information for us.
$table_charset = $this->get_table_charset( $table );
if ( is_wp_error( $table_charset ) ) {
return $table_charset;
}
}
// If still no column information, return the table charset.
if ( empty( $this->col_meta[ $tablekey ] ) ) {
return $this->table_charset[ $tablekey ];
}
// If this column doesn't exist, return the table charset.
if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) {
return $this->table_charset[ $tablekey ];
}
// Return false when it's not a string column.
if ( empty( $this->col_meta[ $tablekey ][ $columnkey ]->Collation ) ) {
return false;
}
list( $charset ) = explode( '_', $this->col_meta[ $tablekey ][ $columnkey ]->Collation );
return $charset;
}
/**
* Retrieves the maximum string length allowed in a given column.
*
* The length may either be specified as a byte length or a character length.
*
* @since 4.2.1
*
* @param string $table Table name.
* @param string $column Column name.
* @return array|false|WP_Error {
* Array of column length information, false if the column has no length (for
* example, numeric column), WP_Error object if there was an error.
*
* @type string $type One of 'byte' or 'char'.
* @type int $length The column length.
* }
*/
public function get_col_length( $table, $column ) {
$tablekey = strtolower( $table );
$columnkey = strtolower( $column );
// Skip this entirely if this isn't a MySQL database.
if ( empty( $this->is_mysql ) ) {
return false;
}
if ( empty( $this->col_meta[ $tablekey ] ) ) {
// This primes column information for us.
$table_charset = $this->get_table_charset( $table );
if ( is_wp_error( $table_charset ) ) {
return $table_charset;
}
}
if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) {
return false;
}
$typeinfo = explode( '(', $this->col_meta[ $tablekey ][ $columnkey ]->Type );
$type = strtolower( $typeinfo[0] );
if ( ! empty( $typeinfo[1] ) ) {
$length = trim( $typeinfo[1], ')' );
} else {
$length = false;
}
switch ( $type ) {
case 'char':
case 'varchar':
return array(
'type' => 'char',
'length' => (int) $length,
);
case 'binary':
case 'varbinary':
return array(
'type' => 'byte',
'length' => (int) $length,
);
case 'tinyblob':
case 'tinytext':
return array(
'type' => 'byte',
'length' => 255, // 2^8 - 1
);
case 'blob':
case 'text':
return array(
'type' => 'byte',
'length' => 65535, // 2^16 - 1
);
case 'mediumblob':
case 'mediumtext':
return array(
'type' => 'byte',
'length' => 16777215, // 2^24 - 1
);
case 'longblob':
case 'longtext':
return array(
'type' => 'byte',
'length' => 4294967295, // 2^32 - 1
);
default:
return false;
}
}
/**
* Checks if a string is ASCII.
*
* The negative regex is faster for non-ASCII strings, as it allows
* the search to finish as soon as it encounters a non-ASCII character.
*
* @since 4.2.0
*
* @param string $input_string String to check.
* @return bool True if ASCII, false if not.
*/
protected function check_ascii( $input_string ) {
if ( function_exists( 'mb_check_encoding' ) ) {
if ( mb_check_encoding( $input_string, 'ASCII' ) ) {
return true;
}
} elseif ( ! preg_match( '/[^\x00-\x7F]/', $input_string ) ) {
return true;
}
return false;
}
/**
* Checks if the query is accessing a collation considered safe.
*
* @since 4.2.0
*
* @param string $query The query to check.
* @return bool True if the collation is safe, false if it isn't.
*/
protected function check_safe_collation( $query ) {
if ( $this->checking_collation ) {
return true;
}
// We don't need to check the collation for queries that don't read data.
$query = ltrim( $query, "\r\n\t (" );
if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $query ) ) {
return true;
}
// All-ASCII queries don't need extra checking.
if ( $this->check_ascii( $query ) ) {
return true;
}
$table = $this->get_table_from_query( $query );
if ( ! $table ) {
return false;
}
$this->checking_collation = true;
$collation = $this->get_table_charset( $table );
$this->checking_collation = false;
// Tables with no collation, or latin1 only, don't need extra checking.
if ( false === $collation || 'latin1' === $collation ) {
return true;
}
$table = strtolower( $table );
if ( empty( $this->col_meta[ $table ] ) ) {
return false;
}
// If any of the columns don't have one of these collations, it needs more confidence checking.
$safe_collations = array(
'utf8_bin',
'utf8_general_ci',
'utf8mb3_bin',
'utf8mb3_general_ci',
'utf8mb4_bin',
'utf8mb4_general_ci',
);
foreach ( $this->col_meta[ $table ] as $col ) {
if ( empty( $col->Collation ) ) {
continue;
}
if ( ! in_array( $col->Collation, $safe_collations, true ) ) {
return false;
}
}
return true;
}
/**
* Strips any invalid characters based on value/charset pairs.
*
* @since 4.2.0
*
* @param array $data Array of value arrays. Each value array has the keys 'value', 'charset', and 'length'.
* An optional 'ascii' key can be set to false to avoid redundant ASCII checks.
* @return array|WP_Error The $data parameter, with invalid characters removed from each value.
* This works as a passthrough: any additional keys such as 'field' are
* retained in each value array. If we cannot remove invalid characters,
* a WP_Error object is returned.
*/
protected function strip_invalid_text( $data ) {
$db_check_string = false;
foreach ( $data as &$value ) {
$charset = $value['charset'];
if ( is_array( $value['length'] ) ) {
$length = $value['length']['length'];
$truncate_by_byte_length = 'byte' === $value['length']['type'];
} else {
$length = false;
/*
* Since we have no length, we'll never truncate. Initialize the variable to false.
* True would take us through an unnecessary (for this case) codepath below.
*/
$truncate_by_byte_length = false;
}
// There's no charset to work with.
if ( false === $charset ) {
continue;
}
// Column isn't a string.
if ( ! is_string( $value['value'] ) ) {
continue;
}
$needs_validation = true;
if (
// latin1 can store any byte sequence.
'latin1' === $charset
||
// ASCII is always OK.
( ! isset( $value['ascii'] ) && $this->check_ascii( $value['value'] ) )
) {
$truncate_by_byte_length = true;
$needs_validation = false;
}
if ( $truncate_by_byte_length ) {
mbstring_binary_safe_encoding();
if ( false !== $length && strlen( $value['value'] ) > $length ) {
$value['value'] = substr( $value['value'], 0, $length );
}
reset_mbstring_encoding();
if ( ! $needs_validation ) {
continue;
}
}
// utf8 can be handled by regex, which is a bunch faster than a DB lookup.
if ( ( 'utf8' === $charset || 'utf8mb3' === $charset || 'utf8mb4' === $charset ) && function_exists( 'mb_strlen' ) ) {
$regex = '/
(
(?: [\x00-\x7F] # single-byte sequences 0xxxxxxx
| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
| [\xE1-\xEC][\x80-\xBF]{2}
| \xED[\x80-\x9F][\x80-\xBF]
| [\xEE-\xEF][\x80-\xBF]{2}';
if ( 'utf8mb4' === $charset ) {
$regex .= '
| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
| [\xF1-\xF3][\x80-\xBF]{3}
| \xF4[\x80-\x8F][\x80-\xBF]{2}
';
}
$regex .= '){1,40} # ...one or more times
)
| . # anything else
/x';
$value['value'] = preg_replace( $regex, '$1', $value['value'] );
if ( false !== $length && mb_strlen( $value['value'], 'UTF-8' ) > $length ) {
$value['value'] = mb_substr( $value['value'], 0, $length, 'UTF-8' );
}
continue;
}
// We couldn't use any local conversions, send it to the DB.
$value['db'] = true;
$db_check_string = true;
}
unset( $value ); // Remove by reference.
if ( $db_check_string ) {
$queries = array();
foreach ( $data as $col => $value ) {
if ( ! empty( $value['db'] ) ) {
// We're going to need to truncate by characters or bytes, depending on the length value we have.
if ( isset( $value['length']['type'] ) && 'byte' === $value['length']['type'] ) {
// Using binary causes LEFT() to truncate by bytes.
$charset = 'binary';
} else {
$charset = $value['charset'];
}
if ( $this->charset ) {
$connection_charset = $this->charset;
} else {
$connection_charset = mysqli_character_set_name( $this->dbh );
}
if ( is_array( $value['length'] ) ) {
$length = sprintf( '%.0f', $value['length']['length'] );
$queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), $length ) USING $connection_charset )", $value['value'] );
} elseif ( 'binary' !== $charset ) {
// If we don't have a length, there's no need to convert binary - it will always return the same result.
$queries[ $col ] = $this->prepare( "CONVERT( CONVERT( %s USING $charset ) USING $connection_charset )", $value['value'] );
}
unset( $data[ $col ]['db'] );
}
}
$sql = array();
foreach ( $queries as $column => $query ) {
if ( ! $query ) {
continue;
}
$sql[] = $query . " AS x_$column";
}
$this->check_current_query = false;
$row = $this->get_row( 'SELECT ' . implode( ', ', $sql ), ARRAY_A );
if ( ! $row ) {
return new WP_Error( 'wpdb_strip_invalid_text_failure', __( 'Could not strip invalid text.' ) );
}
foreach ( array_keys( $data ) as $column ) {
if ( isset( $row[ "x_$column" ] ) ) {
$data[ $column ]['value'] = $row[ "x_$column" ];
}
}
}
return $data;
}
/**
* Strips any invalid characters from the query.
*
* @since 4.2.0
*
* @param string $query Query to convert.
* @return string|WP_Error The converted query, or a WP_Error object if the conversion fails.
*/
protected function strip_invalid_text_from_query( $query ) {
// We don't need to check the collation for queries that don't read data.
$trimmed_query = ltrim( $query, "\r\n\t (" );
if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $trimmed_query ) ) {
return $query;
}
$table = $this->get_table_from_query( $query );
if ( $table ) {
$charset = $this->get_table_charset( $table );
if ( is_wp_error( $charset ) ) {
return $charset;
}
// We can't reliably strip text from tables containing binary/blob columns.
if ( 'binary' === $charset ) {
return $query;
}
} else {
$charset = $this->charset;
}
$data = array(
'value' => $query,
'charset' => $charset,
'ascii' => false,
'length' => false,
);
$data = $this->strip_invalid_text( array( $data ) );
if ( is_wp_error( $data ) ) {
return $data;
}
return $data[0]['value'];
}
/**
* Strips any invalid characters from the string for a given table and column.
*
* @since 4.2.0
*
* @param string $table Table name.
* @param string $column Column name.
* @param string $value The text to check.
* @return string|WP_Error The converted string, or a WP_Error object if the conversion fails.
*/
public function strip_invalid_text_for_column( $table, $column, $value ) {
if ( ! is_string( $value ) ) {
return $value;
}
$charset = $this->get_col_charset( $table, $column );
if ( ! $charset ) {
// Not a string column.
return $value;
} elseif ( is_wp_error( $charset ) ) {
// Bail on real errors.
return $charset;
}
$data = array(
$column => array(
'value' => $value,
'charset' => $charset,
'length' => $this->get_col_length( $table, $column ),
),
);
$data = $this->strip_invalid_text( $data );
if ( is_wp_error( $data ) ) {
return $data;
}
return $data[ $column ]['value'];
}
/**
* Finds the first table name referenced in a query.
*
* @since 4.2.0
*
* @param string $query The query to search.
* @return string|false The table name found, or false if a table couldn't be found.
*/
protected function get_table_from_query( $query ) {
// Remove characters that can legally trail the table name.
$query = rtrim( $query, ';/-#' );
// Allow (select...) union [...] style queries. Use the first query's table name.
$query = ltrim( $query, "\r\n\t (" );
// Strip everything between parentheses except nested selects.
$query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', $query );
// Strip any leading SET STATEMENT statements.
$query = preg_replace( '/^SET STATEMENT.+?\sFOR\s+/is', '', $query );
// Quickly match most common queries.
if ( preg_match(
'/^\s*(?:'
. 'SELECT.*?\s+FROM'
. '|INSERT(?:\s+LOW_PRIORITY|\s+DELAYED|\s+HIGH_PRIORITY)?(?:\s+IGNORE)?(?:\s+INTO)?'
. '|REPLACE(?:\s+LOW_PRIORITY|\s+DELAYED)?(?:\s+INTO)?'
. '|UPDATE(?:\s+LOW_PRIORITY)?(?:\s+IGNORE)?'
. '|DELETE(?:\s+LOW_PRIORITY|\s+QUICK|\s+IGNORE)*(?:.+?FROM)?'
. ')\s+((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)/is',
$query,
$maybe
) ) {
return str_replace( '`', '', $maybe[1] );
}
// SHOW TABLE STATUS and SHOW TABLES WHERE Name = 'wp_posts'
if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES).+WHERE\s+Name\s*=\s*("|\')((?:[0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)\\1/is', $query, $maybe ) ) {
return $maybe[2];
}
/*
* SHOW TABLE STATUS LIKE and SHOW TABLES LIKE 'wp\_123\_%'
* This quoted LIKE operand seldom holds a full table name.
* It is usually a pattern for matching a prefix so we just
* strip the trailing % and unescape the _ to get 'wp_123_'
* which drop-ins can use for routing these SQL statements.
*/
if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES)\s+(?:WHERE\s+Name\s+)?LIKE\s*("|\')((?:[\\\\0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)%?\\1/is', $query, $maybe ) ) {
return str_replace( '\\_', '_', $maybe[2] );
}
// Big pattern for the rest of the table-related queries.
if ( preg_match(
'/^\s*(?:'
. '(?:EXPLAIN\s+(?:EXTENDED\s+)?)?SELECT.*?\s+FROM'
. '|DESCRIBE|DESC|EXPLAIN|HANDLER'
. '|(?:LOCK|UNLOCK)\s+TABLE(?:S)?'
. '|(?:RENAME|OPTIMIZE|BACKUP|RESTORE|CHECK|CHECKSUM|ANALYZE|REPAIR).*\s+TABLE'
. '|TRUNCATE(?:\s+TABLE)?'
. '|CREATE(?:\s+TEMPORARY)?\s+TABLE(?:\s+IF\s+NOT\s+EXISTS)?'
. '|ALTER(?:\s+IGNORE)?\s+TABLE'
. '|DROP\s+TABLE(?:\s+IF\s+EXISTS)?'
. '|CREATE(?:\s+\w+)?\s+INDEX.*\s+ON'
. '|DROP\s+INDEX.*\s+ON'
. '|LOAD\s+DATA.*INFILE.*INTO\s+TABLE'
. '|(?:GRANT|REVOKE).*ON\s+TABLE'
. '|SHOW\s+(?:.*FROM|.*TABLE)'
. ')\s+\(*\s*((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)\s*\)*/is',
$query,
$maybe
) ) {
return str_replace( '`', '', $maybe[1] );
}
return false;
}
/**
* Loads the column metadata from the last query.
*
* @since 3.5.0
*/
protected function load_col_info() {
if ( $this->col_info ) {
return;
}
$num_fields = mysqli_num_fields( $this->result );
for ( $i = 0; $i < $num_fields; $i++ ) {
$this->col_info[ $i ] = mysqli_fetch_field( $this->result );
}
}
/**
* Retrieves column metadata from the last query.
*
* @since 0.71
*
* @param string $info_type Optional. Possible values include 'name', 'table', 'def', 'max_length',
* 'not_null', 'primary_key', 'multiple_key', 'unique_key', 'numeric',
* 'blob', 'type', 'unsigned', 'zerofill'. Default 'name'.
* @param int $col_offset Optional. 0: col name. 1: which table the col's in. 2: col's max length.
* 3: if the col is numeric. 4: col's type. Default -1.
* @return mixed Column results.
*/
public function get_col_info( $info_type = 'name', $col_offset = -1 ) {
$this->load_col_info();
if ( $this->col_info ) {
if ( -1 === $col_offset ) {
$i = 0;
$new_array = array();
foreach ( (array) $this->col_info as $col ) {
$new_array[ $i ] = $col->{$info_type};
++$i;
}
return $new_array;
} else {
return $this->col_info[ $col_offset ]->{$info_type};
}
}
return null;
}
/**
* Starts the timer, for debugging purposes.
*
* @since 1.5.0
*
* @return true
*/
public function timer_start() {
$this->time_start = microtime( true );
return true;
}
/**
* Stops the debugging timer.
*
* @since 1.5.0
*
* @return float Total time spent on the query, in seconds.
*/
public function timer_stop() {
return ( microtime( true ) - $this->time_start );
}
/**
* Wraps errors in a nice header and footer and dies.
*
* Will not die if wpdb::$show_errors is false.
*
* @since 1.5.0
*
* @param string $message The error message.
* @param string $error_code Optional. A computer-readable string to identify the error.
* Default '500'.
* @return false False if the showing of errors is disabled.
*/
public function bail( $message, $error_code = '500' ) {
if ( $this->show_errors ) {
$error = '';
if ( $this->dbh instanceof mysqli ) {
$error = mysqli_error( $this->dbh );
} elseif ( mysqli_connect_errno() ) {
$error = mysqli_connect_error();
}
if ( $error ) {
$message = '' . $error . "
\n" . $message;
}
wp_die( $message );
} else {
if ( class_exists( 'WP_Error', false ) ) {
$this->error = new WP_Error( $error_code, $message );
} else {
$this->error = $message;
}
return false;
}
}
/**
* Closes the current database connection.
*
* @since 4.5.0
*
* @return bool True if the connection was successfully closed,
* false if it wasn't, or if the connection doesn't exist.
*/
public function close() {
if ( ! $this->dbh ) {
return false;
}
$closed = mysqli_close( $this->dbh );
if ( $closed ) {
$this->dbh = null;
$this->ready = false;
$this->has_connected = false;
}
return $closed;
}
/**
* Determines whether the database server is at least the required minimum version.
*
* @since 2.5.0
*
* @global string $required_mysql_version The minimum required MySQL version string.
* @return WP_Error|null
*/
public function check_database_version() {
global $required_mysql_version;
$wp_version = wp_get_wp_version();
// Make sure the server has the required MySQL version.
if ( version_compare( $this->db_version(), $required_mysql_version, '<' ) ) {
/* translators: 1: WordPress version number, 2: Minimum required MySQL version number. */
return new WP_Error( 'database_version', sprintf( __( 'Error: WordPress %1$s requires MySQL %2$s or higher' ), $wp_version, $required_mysql_version ) );
}
return null;
}
/**
* Determines whether the database supports collation.
*
* Called when WordPress is generating the table scheme.
*
* Use `wpdb::has_cap( 'collation' )`.
*
* @since 2.5.0
* @deprecated 3.5.0 Use wpdb::has_cap()
*
* @return bool True if collation is supported, false if not.
*/
public function supports_collation() {
_deprecated_function( __FUNCTION__, '3.5.0', 'wpdb::has_cap( \'collation\' )' );
return $this->has_cap( 'collation' );
}
/**
* Retrieves the database character collate.
*
* @since 3.5.0
*
* @return string The database character collate.
*/
public function get_charset_collate() {
$charset_collate = '';
if ( ! empty( $this->charset ) ) {
$charset_collate = "DEFAULT CHARACTER SET $this->charset";
}
if ( ! empty( $this->collate ) ) {
$charset_collate .= " COLLATE $this->collate";
}
return $charset_collate;
}
/**
* Determines whether the database or WPDB supports a particular feature.
*
* Capability sniffs for the database server and current version of WPDB.
*
* Database sniffs are based on the version of the database server in use.
*
* WPDB sniffs are added as new features are introduced to allow theme and plugin
* developers to determine feature support. This is to account for drop-ins which may
* introduce feature support at a different time to WordPress.
*
* @since 2.7.0
* @since 4.1.0 Added support for the 'utf8mb4' feature.
* @since 4.6.0 Added support for the 'utf8mb4_520' feature.
* @since 6.2.0 Added support for the 'identifier_placeholders' feature.
* @since 6.6.0 The `utf8mb4` feature now always returns true.
*
* @see wpdb::db_version()
*
* @param string $db_cap The feature to check for. Accepts 'collation', 'group_concat',
* 'subqueries', 'set_charset', 'utf8mb4', 'utf8mb4_520',
* or 'identifier_placeholders'.
* @return bool True when the database feature is supported, false otherwise.
*/
public function has_cap( $db_cap ) {
$db_version = $this->db_version();
$db_server_info = $this->db_server_info();
/*
* Account for MariaDB version being prefixed with '5.5.5-' on older PHP versions.
*
* Note: str_contains() is not used here, as this file can be included
* directly outside of WordPress core, e.g. by HyperDB, in which case
* the polyfills from wp-includes/compat.php are not loaded.
*/
if ( '5.5.5' === $db_version && false !== strpos( $db_server_info, 'MariaDB' )
&& ( PHP_VERSION_ID <= 80015 // PHP 8.0.15 or older.
|| 80100 <= PHP_VERSION_ID && PHP_VERSION_ID <= 80102 ) // PHP 8.1.0 to PHP 8.1.2.
) {
// Strip the '5.5.5-' prefix and set the version to the correct value.
$db_server_info = preg_replace( '/^5\.5\.5-(.*)/', '$1', $db_server_info );
$db_version = preg_replace( '/[^0-9.].*/', '', $db_server_info );
}
switch ( strtolower( $db_cap ) ) {
case 'collation': // @since 2.5.0
case 'group_concat': // @since 2.7.0
case 'subqueries': // @since 2.7.0
return version_compare( $db_version, '4.1', '>=' );
case 'set_charset':
return version_compare( $db_version, '5.0.7', '>=' );
case 'utf8mb4': // @since 4.1.0
return true;
case 'utf8mb4_520': // @since 4.6.0
return version_compare( $db_version, '5.6', '>=' );
case 'identifier_placeholders': // @since 6.2.0
/*
* As of WordPress 6.2, wpdb::prepare() supports identifiers via '%i',
* e.g. table/field names.
*/
return true;
}
return false;
}
/**
* Retrieves a comma-separated list of the names of the functions that called wpdb.
*
* @since 2.5.0
*
* @return string Comma-separated list of the calling functions.
*/
public function get_caller() {
return wp_debug_backtrace_summary( __CLASS__ );
}
/**
* Retrieves the database server version number.
*
* @since 2.7.0
*
* @return string|null Version number on success, null on failure.
*/
public function db_version() {
return preg_replace( '/[^0-9.].*/', '', $this->db_server_info() );
}
/**
* Returns the raw version string of the database server.
*
* @since 5.5.0
*
* @return string Database server version as a string.
*/
public function db_server_info() {
return mysqli_get_server_info( $this->dbh );
}
}