Segfault when assigning a reference variable

Hi everyone, I'm trying to implement a virtual method on wxphp that in C++ looks like: size_t wxInputStream::OnSysRead(void* buffer, size_t bufsize) so in php this method is implemented as: public function OnSysRead(&$buffer, $bufsize) here is some sample php code to grasp the idea: http://pastebin.com/ZxVQmfs0 The first time the method is called $buffer is assigned the first bytes of the file correctly but the second time zend engine crashes with a segfault when trying to modify the $buffer variable, so I'm not sure if it is a zend bug or me doing silly stuff. Here the important valgrind output: http://pastebin.com/fhuk6P5r The extensions C++ code that calls the php OnSysRead method: https://github.com/wxphp/wxphp/blob/master/src/streams.cpp#L4681 and here is the adaptation of zend_method_call_with* that im using (which is just a copy paste with minor mod to accept an array of parameters) https://github.com/wxphp/wxphp/blob/master/wxwidgets.cpp#L574 I'm trying to enable this functionality in order to be able to easily load images from phar files by using a custom inputstream that reads using one of the php file functions that supports the stream facilities (in this case phar://) I wrote a graphical interface to work with php phar files https://github.com/jgmdev/phar-gui and I would like to distribute the application it self as a phar file which contains its images. Some other people using wxphp has also requested this functionality and it is an excellent way of distributing self contained desktop applications developed with PHP. Any help is appreciated!