<?php $md5s = []; for ($id=1; true; $id++) { $md5 = str_replace( ['+', '/', '='], '', base64_encode(md5($id . 'something')) ); if (($collision = array_search($md5, $md5s)) !== false) { exit("collision: {$id}, {$md5s[$collision]}"); } if ($id % 100 === 0) { echo "{$id} iterations; no collisions so far\n"; } }
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