3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo $undefined_variable ?? 1; echo $arr[7] ?? 2; echo $object->property ?? 3; echo null ?? 4;
based on DMST7
Output for hhvm-3.15.4, 7.0.0 - 7.3.0beta1
1234
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/Pl3bN on line 3
Process exited with code 255.