3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a(&$a) { $a++; } a(strlen('a')); echo $a;
Output for 5.0.4, 7.0.0 - 7.1.0
Notice: Undefined variable: a in /in/1Q8Rh on line 8
Output for 5.1.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/1Q8Rh on line 6 Notice: Undefined variable: a in /in/1Q8Rh on line 8
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/1Q8Rh on line 6
Process exited with code 255.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/1Q8Rh on line 8