3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = []; $b = $a['foo'] ?? 'bar'; var_dump($b);
Output for 7.0.0 - 7.2.0
string(3) "bar"
Output for 5.4.12 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/CMVOl on line 5
Process exited with code 255.
Output for 5.3.22 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/CMVOl on line 3
Process exited with code 255.