remove "PHP 6" staff
Merge branch 'PHP-5.4' of git.php.net:php-src into PHP-5.4
Merge branch 'PHP-5.4' of git.php.net:php-src into PHP-5.4
Fixed Bug #66034 (Segmentation Fault when constructor of PDO statement throws an exception)

I know zend_call_function will initilize retval_ptr_ptr, but still set
it to NULL explict is more readable