3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a1 = array(); $a2 = array(1 => 'data'); $result = array_merge($a1, $a2); echo $result[1];
based on 0FOeK
Output for 5.3.0 - 7.2.0
Notice: Undefined offset: 1 in /in/tTk9v on line 5
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 1 in /in/tTk9v on line 5