zend_call_method with arguments passed by reference

Hello, I hope this is the appropriate mailing list, please redirect me to better please if required. I am currently rewriting our PHP extension from PHP5 to PHP7. To call PHP methods from our C/C++ code we use slightly modified zend_call_method from Zend/zend_interfaces.c (to use more arguments than 2). Now I found out that it does not work with arguments passed by reference, such as: public function FuncWithRef(array &$changeThis) if values are changed in the PHP code then zval values back in C part after zend_call_function call are not influenced. With PHP5 the value was overwritten and could be used later in C code. Previously the zend_fcall_info struct for function call was filled with params simply by params[0] = &arg1; In PHP7 this is changed to ZVAL_COPY_VALUE(&params[0], arg1); After function is executed (zend_call_function) both fci.params and arg1 contain still the original zval values, changes made in PHP code are not available. Is there any way how to solve this? I am mainly searching for and comparing code snippets in PHP/ext folder to see how things were rewritten from PHP5 to PHP7. Sorry if I missed something obvious and thank you for your help.