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<?php $count = array_fill(0, 32, 0); for ($i = 0; $i < 100000; ++$i) { $key = random_bytes(32); $comp = gzcompress($key); $count[mb_strlen($comp, '8bit')]++; } var_dump($count);

preferences:
35.46 ms | 402 KiB | 5 Q