3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = []; $key = 'foo'; $val = $arr[$key] ?? null; unset($arr[$key]); echo $val;
Output for 7.0.0 - 7.2.0
Output for 5.4.2 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/J4fpO on line 6
Process exited with code 255.
Output for 5.3.18 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/J4fpO on line 3
Process exited with code 255.