Timber\Cache\Cleaner::delete_transients_single_site PHP Метод

    protected static function delete_transients_single_site()
    {
        global $wpdb;
        $sql = "\n\t\t\t\tDELETE\n\t\t\t\t\ta, b\n\t\t\t\tFROM\n\t\t\t\t\t{$wpdb->options} a, {$wpdb->options} b\n\t\t\t\tWHERE\n\t\t\t\t\ta.option_name LIKE '%_transient_%' AND\n\t\t\t\t\ta.option_name NOT LIKE '%_transient_timeout_%' AND\n\t\t\t\t\tb.option_name = CONCAT(\n\t\t\t\t\t\t'_transient_timeout_',\n\t\t\t\t\t\tSUBSTRING(\n\t\t\t\t\t\t\ta.option_name,\n\t\t\t\t\t\t\tCHAR_LENGTH('_transient_') + 1\n\t\t\t\t\t\t)\n\t\t\t\t\t)\n\t\t\t\tAND b.option_value < UNIX_TIMESTAMP()\n\t\t\t";
        return $wpdb->query($sql);
    }