3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function a($name) { $_SESSION[$name] = $$name; } a('a'); $a = 'abc'; echo $_SESSION['a'];
based on aAsj3
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: a in /in/pvsZs on line 5
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/pvsZs on line 5