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run code in 300+ PHP versions simultaneously
<?php for ($i = 64; $i < 80; ++$i) { echo "{$i}.\t".password_hash(str_repeat('a', $i), PASSWORD_DEFAULT, array('salt' => '$2y$04$usesomesillystringforsalt$'))."\n"; }

preferences:
31.04 ms | 402 KiB | 5 Q