&reftitle.runtime; &extension.runtime; Name Default Changeable pdo_mysql.default_socket "/tmp/mysql.sock" PHP_INI_SYSTEM pdo_mysql.debug NULL PHP_INI_SYSTEM &ini.php.constants; &ini.descriptions.title; pdo_mysql.default_socket string Sets a Unix domain socket. This value can either be set at compile time if a domain socket is found at configure. This ini setting is Unix only. pdo_mysql.debug boolean Enables debugging for PDO_MYSQL. This setting is only available when PDO_MYSQL is compiled against mysqlnd and in PDO debug mode.