wpdb::has_cap( string $db_cap ): bool

4078	public function has_cap( $db_cap ) {4079		$db_version     = $this->db_version();4080		$db_server_info = $this->db_server_info();4081 4082		/*4083		 * Account for MariaDB version being prefixed with '5.5.5-' on older PHP versions.4084		 *4085		 * Note: str_contains() is not used here, as this file can be included4086		 * directly outside of WordPress core, e.g. by HyperDB, in which case4087		 * the polyfills from wp-includes/compat.php are not loaded.4088		 */4089		if ( '5.5.5' === $db_version && false !== strpos( $db_server_info, 'MariaDB' )4090			&& PHP_VERSION_ID < 80016 // PHP 8.0.15 or older.4091		) {4092			// Strip the '5.5.5-' prefix and set the version to the correct value.4093			$db_server_info = preg_replace( '/^5\.5\.5-(.*)/', '$1', $db_server_info );4094			$db_version     = preg_replace( '/[^0-9.].*/', '', $db_server_info );4095		}4096 4097		switch ( strtolower( $db_cap ) ) {4098			case 'collation':    // @since 2.5.04099			case 'group_concat': // @since 2.7.04100			case 'subqueries':   // @since 2.7.04101				return version_compare( $db_version, '4.1', '>=' );4102			case 'set_charset':4103				return version_compare( $db_version, '5.0.7', '>=' );4104			case 'utf8mb4':      // @since 4.1.04105				return true;4106			case 'utf8mb4_520': // @since 4.6.04107				return version_compare( $db_version, '5.6', '>=' );4108			case 'identifier_placeholders': // @since 6.2.04109				/*4110				 * As of WordPress 6.2, wpdb::prepare() supports identifiers via '%i',4111				 * e.g. table/field names.4112				 */4113				return true;4114		}4115 4116		return false;4117	}