Help on ZVAL (array) memory management

Hi all, I am writing a C extension for PHP using zend API. But I got serious memory leak problem. They seems related to freeing zval hashtable. The following is a snippet of my code: MAKE_STD_ZVAL (myzval); if (array_init (myzval) == FAILURE) { } ZEND_SET_SYMBOL (myzval->value.ht, key, zarray); Can anyone give me some pointer on when and how to release the memory allocated? It will be hihgly appreciated if you can also point me some documents I can read through. Thanks and Happy Holiday. -huajie