3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(1); $r =& $a[0]; $b = $a; $b[1] = 999; $b[0] = 2; var_dump($a[1]); var_dump($a[0]);
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 1 in /in/0BvZn on line 8 NULL int(2)
Output for hhvm-3.10.0 - 3.12.0
Notice: Undefined index: 1 in /in/0BvZn on line 8 NULL int(2)
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 1 in /in/0BvZn on line 8 NULL int(2)