3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $b = &$a; $a[] = $b;
Output for 4.3.0 - 5.2.17, 5.3.4 - 7.1.0
Output for 5.3.0 - 5.3.3

Process exited with code 139.