3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function f(&$a) {} function g($a) { $v = $a; return $v; } f(g(3));
Output for 7.0.0 - 7.2.0
Notice: Only variables should be passed by reference in /in/liFhR on line 6
Output for 5.1.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/liFhR on line 6
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/liFhR on line 6
Process exited with code 255.
Output for 4.3.0 - 5.0.4