3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function factorial(&$number) { return $number*2; } $a=5; print factorial($a+1); echo $a; ?>
based on mN6V4
Output for 4.3.2 - 5.4.32
Fatal error: Only variables can be passed by reference in /in/SU7hQ on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/SU7hQ on line 7