3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php usort(array('a', 'b', 'c', 'd'), 'some_sort_function'); function some_sort_function($a, $b) { static $foo = NULL; if ($foo === NULL) { $foo = 'bar'; echo "just once?\n"; } return 0; }
based on PY65I
Output for 4.3.2 - 5.4.32
Fatal error: Only variables can be passed by reference in /in/Ng8JL on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/Ng8JL on line 3