3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $var = array('a' => 1, 'b' => 2); echo $var['a'] ?? -1;
Output for 7.0.0 - 7.2.0
1
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/aq74t on line 5
Process exited with code 255.