3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = null; $b = []; $b['a'] = 'a'; $c = $a ?? $b['b'] ?? $d['d'] ?? $b['a']; echo $c;
Output for 7.0.0 - 7.2.0
a
Output for 5.4.9 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/6Qp8Y on line 7
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6Qp8Y on line 4
Process exited with code 255.