note 115365 added to language.operators.bitwise

@zooly Don't forget the leading zeros. It's very important if you want to write a function similar to the assembly instructions 'ror' and 'rol' (Rotate on Right and Rotate on Left), because of dword value; rotating the binary always takes 32 positions and includes the leading zeros! So this is the right way: <?php function rotate ($decimal, $bits) { $binary = decbin($decimal); $binary = str_pad($binary, 32, '0', STR_PAD_LEFT); return ( bindec(substr($binary, $bits).substr($binary, 0, $bits)) ); } ?> Look at this assembly code: mov edx, 1bf5616c ror edx, 8 After this operation: edx = 0x6c1bf561 (binary: 1101100000110111111010101100001) But your code returns 0x0d9bf561 (binary: 1101100110111111010101100001) In order to get the right value you have to add the leading zeros by adding that line with strpad() (see above). Very important! ---- Server IP: 72.52.91.14 Probable Submitter: 82.95.102.9 ---- Manual Page -- http://php.net/manual/en/language.operators.bitwise.php Edit -- https://master.php.net/note/edit/115365 Del: integrated -- https://master.php.net/note/delete/115365/integrated Del: useless -- https://master.php.net/note/delete/115365/useless Del: bad code -- https://master.php.net/note/delete/115365/bad+code Del: spam -- https://master.php.net/note/delete/115365/spam Del: non-english -- https://master.php.net/note/delete/115365/non-english Del: in docs -- https://master.php.net/note/delete/115365/in+docs Del: other reasons-- https://master.php.net/note/delete/115365 Reject -- https://master.php.net/note/reject/115365 Search -- https://master.php.net/manage/user-notes.php