3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function f(&$a) {} function &g($a) { $v = $a; return $v; } $a = function() {}; echo "a"; f(1+1);
Output for 5.3.0 - 5.4.19
Fatal error: Only variables can be passed by reference in /in/uqNVl on line 10
Process exited with code 255.