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@ 2017-12-21T14:46:08Z

<?php
$c5 = 215601;
$c1 = 6;
$p = str_pad($c1, 3, '0', STR_PAD_LEFT) . str_pad($c5, 10, '0', STR_PAD_LEFT);

$ctr = 22;
$ctro = '0' . substr($p,2,2) . substr($p,7);

echo $p;
echo $ctro;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
str_pad: documentation ( source)

preferences:dark modelive preview

56.15 ms | 402 KiB | 5 Q