3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = '0631'; $str = str_pad(((int)$x) + 1, 4, '0', STR_PAD_LEFT); var_dump($str);
based on YrCEJ
Output for 4.3.0 - 7.2.0
string(4) "0632"