dispatch.c line 292 in function
static HRESULT STDMETHODCALLTYPE disp_invokdeex
will not give the expected results..

I found this while writing my own function to use call_user_function_ex to call a function with params.. And was searching through the PHP code to see how it was called elsewhere.. and this function is doing it the same way I was doing it.. which doesn't work..

in line 270 a zval *zarg is allocated. then it is initialized once for each argument.. the argument is assigned to the zarg then the address of the zarg is stored in the **params[] array.
The problem is the *zarg has the same address for each iteration.. so every params[i]=&zarg will assign the same address for every parameter "i". so all the paramters will be the last parameter passed..

a zval ** needs to be allocated instead of a zval *..  so the address is different for each parameter..
since I capped the maximum number of params I just allocate a zval *zarg[4]; but a more dynamic solution would be better.