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<?php $a = md5('QNKCDZO'); $b = md5('QNKCDZO'); var_dump(md5('QNKCDZO') == md5('QNKCDZO')); // should true because same content var_dump(md5('QNKCDZO') === md5('QNKCDZO')); // should true because not same variable / ram var_dump($a == $b); // should true because same content var_dump($a === $b); // should false because not same variable / ram

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