note 28964 deleted from language.operators.bitwise by sniper

Note Submitter: kalle.alm@home.se ---- A way to create pretty efficient permission checks is: define( "PERM_READ", 1 ); define( "PERM_WRITE", 2 ); define( "PERM_EDIT", 4 ); define( "PERM_DELETE", 8 ); /* etc as 16, 32, 64, 128, ... */ /* ... somewhere we set/get the user permissions and set them like ... */ $user_permissions = PERM_READ + PERM_WRITE + PERM_EDIT; /* we grab the sum of the various permissions */ /* ... and then whenever we want to make sure a set of permission prerequisites are met by the user's permission we call: */ function request_privs( $got_perm, $need_perm ){ if( ($got_perm & $need_perm) == $need_perm ) return; echo( "Permission denied!" ); exit; }