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@ 2018-03-06T08:09:31Z

<?php
var_dump(preg_replace('#(\d{3})(\d{3})(\d{4})#', '$1-$2-$3', '0123456789'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

29.17 ms | 478 KiB | 5 Q