3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $exists = isset($a); if($exists) echo "SI"; else var_dump("NO");
based on B8f3e
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(2) "NO"
Output for hhvm-3.10.0

Process exited with code 153.