3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function f(&$a) {} function g($a) { $v = $a; return $v; } f(3);
Output for 5.3.0 - 5.4.19
Fatal error: Only variables can be passed by reference in /in/K1M41 on line 6
Process exited with code 255.