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@ 2017-06-12T07:41:00Z

<?php

$input = '1330';
var_dump( $input, mb_substr($input, 0, 2) . ':' . mb_substr($input, 2, 2));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
mb_substr: documentation ( source)

preferences:dark modelive previewkey bindings

27.45 ms | 405 KiB | 5 Q