note 99335 added to language.operators.bitwise

Be very careful when XOR-ing strings! If one of the values is empty (0, '', null) the result will also be empty! <?php var_dump(1234 ^ 0); // int(1234) var_dump(1234 ^ ''); // int(1234) var_dump(1234 ^ null); // int(1234) var_dump('hello world' ^ 0); // int(0) var_dump('hello world' ^ ''); // string(0) "" var_dump('hello world' ^ null); // int(0) ?> This seems rather inconsistent behavior. An integer XOR'd with zero results the original integer. But a string XOR'd with an empty value results an empty value! My password hashing function was always returning the same hash... Because I was XOR-ing it with a salt that was sometimes empty! ---- Server IP: 69.147.83.197 Probable Submitter: 88.192.75.163 ---- Manual Page -- http://www.php.net/manual/en/language.operators.bitwise.php Edit -- https://master.php.net/note/edit/99335 Del: integrated -- https://master.php.net/note/delete/99335/integrated Del: useless -- https://master.php.net/note/delete/99335/useless Del: bad code -- https://master.php.net/note/delete/99335/bad+code Del: spam -- https://master.php.net/note/delete/99335/spam Del: non-english -- https://master.php.net/note/delete/99335/non-english Del: in docs -- https://master.php.net/note/delete/99335/in+docs Del: other reasons-- https://master.php.net/note/delete/99335 Reject -- https://master.php.net/note/reject/99335 Search -- https://master.php.net/manage/user-notes.php