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@ 2015-07-07T21:38:09Z

<?php

$v = '10155674128355111';

if (strlen($v) > 9)
{
    echo (int)((int)substr($v, 0, 9) % 6 . substr($v, 9)) % 6;
}
else
{
    echo (int)$v % 6;
}

Output
Performance
VLD
References
Branches

substr: documentation ( source)

preferences:dark modelive preview

61.69 ms | 402 KiB | 5 Q