Description:
------------
Segfaults appear when using:
mysql_pconnect('localhost', 'foo', 'bar', 0);
but runs fine when using:
mysql_pconnect('localhost', 'foo', 'bar');

The bug is most likely caused by trying to store a 'long' value in an 'int' on the stack.

At the beginning of php_mysql_do_connect() in ext/mysql/php_mysql.c there is the following declaration:
int client_flags = 0;

Later in that function zend_parse_parameters() stores a long at &client_flags, which can also overwrite another variable on the stack.

Changing the client_flags to unsigned long (like it is defined in mysql's headers) solved my segfault problem.


Reproduce code:
---------------
// the user/pass don't have to be valid.
mysql_pconnect('localhost', 'foo', 'bar', 0);


Expected result:
----------------
No segfault.

Actual result:
--------------
Segfault. No php/zend error message in logs.