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@ 2017-03-03T21:21:47Z

<?php

$str = '20170131';

$a = str_split($str, 4);
$b = str_split($a[1], 2);

var_dump("{$b[1]}-{$b[0]}-{$a[0]}");

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
str_split: documentation ( source)

preferences:dark modelive previewkey bindings

43.95 ms | 1943 KiB | 5 Q