Description:
------------
pdo_drivers() is not documented as it seems, 
http://de.php.net/manual-lookup.php?pattern=pdo_drivers&lang=en

Please document or remove it.

ext/pdo/pdo.c
/* {{{ proto array pdo_drivers()
 Return array of available PDO drivers */
PHP_FUNCTION(pdo_drivers)
{
	HashPosition pos;
	pdo_driver_t **pdriver;
	
	array_init(return_value);

	zend_hash_internal_pointer_reset_ex(&pdo_driver_hash, &pos);
	while (SUCCESS == zend_hash_get_current_data_ex(&pdo_driver_hash, (void**)&pdriver, &pos)) {
		add_next_index_stringl(return_value, (char*)(*pdriver)->driver_name, (*pdriver)->driver_name_len, 1);
		zend_hash_move_forward_ex(&pdo_driver_hash, &pos);
	}
}
/* }}} */


Reproduce code:
---------------
nixnutz@ulflinux:~/php53> sapi/cli/php -r "var_dump(pdo_drivers());"
array(3) {
  [0]=>
  string(7) "sqlite2"
  [1]=>
  string(6) "sqlite"
  [2]=>
  string(5) "mysql"
}


Expected result:
----------------
Well, result is fine. It should be documented that's all.