3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $id = 39983; $strLength = strlen($id); echo str_pad(39983, 4, "0", STR_PAD_LEFT);
based on XWUdV
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
39983