3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function a(&$a) { $a++; } a($a = 5); echo $a;
Output for 7.0.0 - 7.2.0
Notice: Only variables should be passed by reference in /in/S2T6d on line 6 5
Output for 5.1.2 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/S2T6d on line 6 5
Output for 4.3.0 - 5.1.1
6