3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php error_reporting(E_ALL); var_dump( $boy ?? 'cat' );
based on J45qU
Output for hhvm-3.15.4, 7.0.0 - 7.2.6
string(3) "cat"
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/JQKMF on line 4
Process exited with code 255.