3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 1; $b = &$a; unset($b); var_dump($a); var_dump($b);
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(1) Notice: Undefined variable: b in /in/J7Mel on line 7 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
int(1) Notice: Undefined variable: b in /in/J7Mel on line 7 NULL