3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $id = 3; $str = "active$id"; $$str = 1; echo "STR = $str\n"; echo "A = $active3\n"; ?>
based on VfdZY
Output for 4.3.0 - 7.2.0
STR = active3 A = 1