- zend_call_method_with_2_params(arg->zconv, NULL, NULL, "converttostring", &rv, zparam, &ztype);
- str = zval_get_string(&rv);
+ php_pq_call_method(arg->zconv, "converttostring", 2, &rv, zparam, &ztype);
+ tmpstr = zval_get_string(&rv);
+ zval_ptr_dtor(&rv);