3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; $a = null; var_dump($a); echo isset($a)? 'true' : 'false',"\n"; unset($a); var_dump($a); echo isset($a)? 'true' : 'false',"\n";
Output for 5.0.4 - 7.2.0
NULL false Notice: Undefined variable: a in /in/07kcK on line 7 NULL false
Output for 4.3.0 - 5.0.3
NULL false Notice: Undefined variable: a in /in/07kcK on line 7 NULL false