3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array(); $arr['a'] = array(); $a = $arr['a']; $a['1'] = 999; print_r($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [a] => Array ( ) )
Output for hhvm-3.10.0

Process exited with code 153.