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@ 2014-02-10T19:03:30Z

<?php
$d = '91224562ec13207b6e8e18d5b7918f55';
$i = 0;
$test = function() use ($i) {
    return md5($i . '5.5.2.2a1');
};
while ($test() != $d) {
    $i++;
}

Output
Performance
VLD
References
Branches

md5: documentation ( source)

preferences:dark modelive preview

39.49 ms | 402 KiB | 5 Q