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@ 2016-12-16T12:15:46Z

<?php

$numb = "00001";
$numb = $numb +1;
echo str_pad($numb, 5, '0', STR_PAD_LEFT);

Output
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str_pad: documentation ( source)

preferences:dark modelive preview

52.48 ms | 402 KiB | 5 Q