note 73088 added to language.operators.bitwise

I found the 31-bit limitation on the bitwise ands to be a bit frustrating in large scale permission control applications. I have a situation involving page-level access with more than 50 pages. I was able to workaround the limitation by adding a loop that dropped 31 bits off of the right until the resource identifier bit is within the first 31. <?php $userlevel = $session->userlevel - 0; # the subtraction ensures int type $pg_code = pow(2,($pg_id-1)); while ($pg_code >= 2147483648) { $pg_code = $pg_code/pow(2,31); $userlevel = $session->userlevel/pow(2,31) ; } if (!($userlevel - 0 & $pg_code)) { #if not authorized, show the unauthorized page header('Location: Unauthorized.php'); exit; } ?> ---- Server IP: 64.71.164.2 Probable Submitter: 71.34.217.179 ---- Manual Page -- http://www.php.net/manual/en/language.operators.bitwise.php Edit -- https://master.php.net/note/edit/73088 Del: integrated -- https://master.php.net/note/delete/73088/integrated Del: useless -- https://master.php.net/note/delete/73088/useless Del: bad code -- https://master.php.net/note/delete/73088/bad+code Del: spam -- https://master.php.net/note/delete/73088/spam Del: non-english -- https://master.php.net/note/delete/73088/non-english Del: in docs -- https://master.php.net/note/delete/73088/in+docs Del: other reasons-- https://master.php.net/note/delete/73088 Reject -- https://master.php.net/note/reject/73088 Search -- https://master.php.net/manage/user-notes.php