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@ 2015-11-12T12:44:20Z

<?php

$hash = "0";

for ($i = 1; $i <= 100000; $i++) {
    if (hash_hmac('crc32', $i, 'mysecretkey') == $hash) {
        echo 'Found within ' . $i . PHP_EOL;
        break;
    }
}

Output
Performance
VLD
References
Branches

hash_hmac: documentation ( source)

preferences:dark modelive preview

41.32 ms | 402 KiB | 5 Q