3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a($a) { $a = 7; } $a = 0; a(&$a); print_r($a); ?>
Output for 5.4.0 - 5.4.14
Fatal error: Call-time pass-by-reference has been removed; If you would like to pass argument by reference, modify the declaration of a(). in /in/gRXYC on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29
7