3v4l.org

run code in 300+ PHP versions simultaneously
<?php $id = 39983; $strLength = strlen($id); echo str_pad(39983, 4, "0", STR_PAD_LEFT);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
39983

preferences:
146.4 ms | 403 KiB | 175 Q