3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php ${"#1233"} = 'my string'; echo ${"#123"};
based on uIe3e
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: #123 in /in/m6bi8 on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: #123 in /in/m6bi8 on line 3