3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = $_GET['bar'] ?? 'hello'; echo $foo . "\n"; $_GET['bar'] = 'good bye'; $foo = $_GET['bar'] ?? 'hello'; echo $foo;
based on NKmSK
Output for 7.0.0 - 7.2.0
hello good bye
Output for 5.5.0 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/0CfbE on line 2
Process exited with code 255.