3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php key(array('foo' => NULL)); echo 1;
Output for 4.4.1, 5.1.0 - 7.1.0
1
Output for 4.3.2 - 4.4.0, 4.4.2 - 5.0.5
Fatal error: Only variables can be passed by reference in /in/hcM5G on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/hcM5G on line 3