10-12-2008, 03:53 PM
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#136 (permalink)
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The Prestige
Join Date: Oct 2007
Location: Manchester, UK
Posts: 854
Thanks: 32
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Sorry for going slightly off topic, but to answer Jim's question:
Quote:
Originally Posted by Jim
Bits? What be that?
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Using bits for user permissions, like this example:
PHP Code:
class level_flags
{
const VIEW = 0x01;
const ADD = 0x02;
const DELETE = 0x04;
const EDIT = 0x08;
}
// Set the user's permissions
$userFlags = level_flags::ADD | level_flags::EDIT;
// Does the user have permission to VIEW?
if($userFlags & level_flags::VIEW)
{
die('Yes');
}
else
{
die('Go away!');
}
Here i have used hex to show each permission and used the & bitwise operator to check if the correct bits are set, thus giving us a powerful permission system.
This particular example returns 'Go Away!' because the VIEW isnt set within $userFlags which only has ADD and EDIT bits set.
This technique is used in a script that Wildhoney posted not long ago: Easy to Modify Login Script with Hierarchical User Permissions and XML Account File
Here is a great bitwise resource: PHP Bitwise Tutorial by Jim Plush
__________________
mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)
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