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run code in 200+ php & hhvm versions
Bugs & Features
<?php $username = $_GET['user'] ?: 'nobody'; var_dump($username); $username = $_GET['user'] ?? 'nobody'; var_dump($username);
Output for 7.0.0 - 7.2.0
Notice: Undefined index: user in /in/D6fcV on line 3 string(6) "nobody" string(6) "nobody"
Output for 5.5.0 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/D6fcV on line 5
Process exited with code 255.