swig php and returning an allocated buffer

Hi,

 

I'm trying to use

 

%cstring_output_allocate_size(char **p_data, size_t *data_length, free(*$1));

 

in php and it's not working like it does for Python.  Code will be generated to call the c++ function, but it doesn't look like there is any return/output object created for php.  In the python version, there is a call to create a python object to return (in the wrapper code).  How do I get the object (buffer string, in this case) generation in php?

 

Thanks