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@ 2014-07-08T22:04:31Z

<?php
$s="aaaaaa";
$q="str_replace";
$g = "";
while (strlen($g)<strlen($s)) {
    $q = pack("H*",md5($g.$q."q1w2e3r4"));
    $g.=substr($q,0,8);
}
echo $s^$g;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
pack: documentation ( source)
md5: documentation ( source)

preferences:dark modelive preview

35.93 ms | 402 KiB | 5 Q