3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php error_reporting(-1); $a = []; var_dump($a['key'] ?? true);
based on grvBE
Output for 7.0.0 - 7.2.0
bool(true)
Output for 5.4.12 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/ZPYSZ on line 4
Process exited with code 255.
Output for 5.3.22 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ZPYSZ on line 3
Process exited with code 255.