Description:
------------
I have a Drupal site. It worked ok until I upgraded php to 5.3.2. It simply fails, nothing is written to the error log or on the screen.

I tracked down the problem to the following point: 
 * in some file, there is this call: 
     return call_user_func($hook_function, $variables, $suggestions);
 where $hook_function is _phptemplate_page
 * _phptemplate_page function is defined as: 
    function _phptemplate_page(&$variables, &$suggestions) {
     ....
    }
If I remove the & before variables, the site works. I know the by-reference variable behavior changed in 5.3.2 from 5.2, but in this case, the actual parameters are still 2 variables (not constants).

Cheers,
Andrei

Test script:
---------------
<?php

function testfnc1($x) {
  echo "testfnc1: $x ";
}

function testfnc2(&$x) {
  echo "testfnc2: $x ";
}

$y = 'works';
call_user_func('testfnc1', $y);
call_user_func('testfnc2', $y);

Expected result:
----------------
testfnc1: works testfnc2: works 

Actual result:
--------------
testfnc1: works