Description:
------------
After upgrading to PHP 5.3.2, we ran it through Purify and noticed the following memory leak:

MLK: 32 bytes leaked at 0x9b70ca8
  * This memory was allocated from:
    calloc         [rtlib.o]
    _zend_hash_init [zend_hash.c:168]
    php_cgi_globals_ctor [cgi_main.c:1429]
    allocate_new_resource [TSRM.c:303]
    ts_resource_ex [TSRM.c:370]
    .
    .
    .

The problem is that php_cgi_globals_ctor() (the constructor) is calling zend_hash_init() but there is no corresponding destructor to call zend_hash_destroy(). I have attached a patch that will fix this.

You will notice in the patch that I had to make changes to zend_hash_destroy() to prevent a double free. Apparently there are places that are already calling zend_hash_destroy() for the hash that is initialized in php_cgi_globals_ctor(), but it is not currently getting called all of the time. Perhaps a more correct fix would be to find where these other calls to zend_hash_destroy() are being made and either eliminate them altogether or make sure they are called all of the time and not have the destructor function.