权限控制类
[code]<?php/**
* Displays : 权限控制类
* Author : phpox
* Date : Fri Nov 30 13:13:48 CST 2007
*/
class include_purview
{
/**
* 类的唯一实例
*/
private static $instance;
/**
* 权限常量
*/
const SELECT = 0x1; //查询
const CREATE = 0x2; //添加
const EDIT = 0x4; //修改
const DELETE = 0x8; //删除
/**
* 角色
*/
private $annoy = ''; //匿名用户
private $user = ''; //注册用户
private $admin = ''; //管理用户
private $usertype = 'annoy';
private $hashtable = array(1=>'查询',2=>'添加',4=>'修改',8=>'删除');
/**
*
*/
public function __set($name,$value)
{
if ($name == 'usertype')
{
if ($value != '')
{
$this->usertype = $value;
}
}
}
/**
* 构造函数 给角色赋予权限
*/
private function __construct()
{
$this->annoy = self::SELECT;
$this->user = self::SELECT | self::CREATE;
$this->admin = self::SELECT | self::CREATE | self::EDIT | self:ELETE;
}
/**
* 获取类的唯一实例
*/
public static function getInstance()
{
if (self:instance === null){
self:instance = new include_purview();
}
return self:instance;
}
/**
* 检查权限
*
* @param $usertype 角色
* @param $purview 权限
*/
public function check($purview)
{
if ($this->{$this->usertype} & $purview)
{
return true;
}
return false;
}
/**
* 给角色加权限
*/
public function addPur($purview)
{
$this->{$this->usertype} |= $purview;
}
/**
* 给角色减权限
*/
public function delPur($purview)
{
$this->{$this->usertype} ^= $purview;
}
/**
* 返回角色拥有的权限
*/
public function getPur()
{
$arr = array();
foreach ($this->hashtable as $k => $v)
{
if ($k & $this->{$this->usertype})
{
$arr[] = $v;
}
}
return $arr;
}
}
?>[/code]
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