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@ 2014-07-25T15:22:57Z

<?php

$string = '2014333300023';

echo implode('-', str_split($string, 4));

Output
Performance
VLD
References
Branches

implode: documentation ( source)
str_split: documentation ( source)

preferences:dark modelive preview

41.86 ms | 402 KiB | 5 Q