another WTF in PHP. Makes sense, technically, but as a use it makes no sense.

pass_by_ref_WTF.php

<?php
function foo($bar) {
  var_dump($bar);
}
foo(array()); # => array(0) {}

## Works as expected. But now...

function foo(&$bar) {
  var_dump($bar);
}
foo(array()); # PHP Fatal error:  Only variables can be passed by reference in /home/ber/.../test.php on line X

# Yup. fail.