3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array(1, 2, 3, 4, 5); foreach($arr as $key => $row) { echo key($arr); }
Output for 4.3.0 - 4.4.0, 4.4.2 - 5.2.3, 7.0.0 - 7.1.0
00000
Output for 5.2.4 - 5.6.28
11111
Output for 4.4.1
1234