3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; $a = null; echo isset($a) ? 'true' : 'false', "\n"; var_dump($a); unset($a); var_dump($a);
Output for 5.0.4 - 7.2.0
false NULL Notice: Undefined variable: a in /in/WDm90 on line 7 NULL
Output for 4.3.0 - 5.0.3
false NULL Notice: Undefined variable: a in /in/WDm90 on line 7 NULL