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* Called when WordPress is generating the table scheme.

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* Use `wpdb::has_cap( 'collation' )`.

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* @since 2.5.0

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* @deprecated 3.5.0 Use wpdb::has_cap()

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* @return bool True if collation is supported, false if not.

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public function supports_collation() {

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_deprecated_function( __FUNCTION__, '3.5.0', 'wpdb::has_cap( \'collation\' )' );

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return $this->has_cap( 'collation' );

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}

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/**

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* Retrieves the database character collate.

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* @since 3.5.0

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* @return string The database character collate.

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public function get_charset_collate() {

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$charset_collate = '';

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if ( ! empty( $this->charset ) ) {

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$charset_collate = "DEFAULT CHARACTER SET $this->charset";

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}

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if ( ! empty( $this->collate ) ) {

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$charset_collate .= " COLLATE $this->collate";

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}

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return $charset_collate;

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}

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/**

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* Determines whether the database or WPDB supports a particular feature.

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* Capability sniffs for the database server and current version of WPDB.

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* Database sniffs are based on the version of MySQL the site is using.

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* WPDB sniffs are added as new features are introduced to allow theme and plugin

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* developers to determine feature support. This is to account for drop-ins which may

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* introduce feature support at a different time to WordPress.

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* @since 2.7.0

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* @since 4.1.0 Added support for the 'utf8mb4' feature.

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* @since 4.6.0 Added support for the 'utf8mb4_520' feature.

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* @since 6.2.0 Added support for the 'identifier_placeholders' feature.

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* @since 6.6.0 The `utf8mb4` feature now always returns true.

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* @see wpdb::db_version()

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* @param string $db_cap The feature to check for. Accepts 'collation', 'group_concat',

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* 'subqueries', 'set_charset', 'utf8mb4', 'utf8mb4_520',

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* or 'identifier_placeholders'.

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* @return bool True when the database feature is supported, false otherwise.

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public function has_cap( $db_cap ) {

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$db_version = $this->db_version();

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$db_server_info = $this->db_server_info();

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* Account for MariaDB version being prefixed with '5.5.5-' on older PHP versions.

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* Note: str_contains() is not used here, as this file can be included

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* directly outside of WordPress core, e.g. by HyperDB, in which case

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* the polyfills from wp-includes/compat.php are not loaded.

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if ( '5.5.5' === $db_version && false !== strpos( $db_server_info, 'MariaDB' )

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&& PHP_VERSION_ID < 80016 // PHP 8.0.15 or older.

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) {

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// Strip the '5.5.5-' prefix and set the version to the correct value.

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$db_server_info = preg_replace( '/^5\.5\.5-(.*)/', '$1', $db_server_info );

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$db_version = preg_replace( '/[^0-9.].*/', '', $db_server_info );

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}

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switch ( strtolower( $db_cap ) ) {

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case 'collation': // @since 2.5.0

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case 'group_concat': // @since 2.7.0

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case 'subqueries': // @since 2.7.0

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return version_compare( $db_version, '4.1', '>=' );

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case 'set_charset':

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return version_compare( $db_version, '5.0.7', '>=' );

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case 'utf8mb4': // @since 4.1.0

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return true;

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case 'utf8mb4_520': // @since 4.6.0

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return version_compare( $db_version, '5.6', '>=' );

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case 'identifier_placeholders': // @since 6.2.0

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* As of WordPress 6.2, wpdb::prepare() supports identifiers via '%i',

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* e.g. table/field names.

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return true;

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}

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return false;

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}

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/**

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* Retrieves a comma-separated list of the names of the functions that called wpdb.

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* @since 2.5.0

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* @return string Comma-separated list of the calling functions.

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public function get_caller() {

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return wp_debug_backtrace_summary( __CLASS__ );

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}

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/**

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* Retrieves the database server version.

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* @since 2.7.0

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* @return string|null Version number on success, null on failure.

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public function db_version() {

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return preg_replace( '/[^0-9.].*/', '', $this->db_server_info() );

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}

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/**

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* Returns the version of the MySQL server.

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* @since 5.5.0

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* @return string Server version as a string.

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public function db_server_info() {

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return mysqli_get_server_info( $this->dbh );

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}

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}

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