PHP-權限控制類

http://blog.csdn.net/painsonline/article/details/7183679

<?php
/**
* 權限控制類
*/

class include_purview
{
    /**
      * 類的惟一實例
      */
    private static $instance;

    /**
      * 權限常量
      */
    const SELECT = 0x1; //查詢
    const CREATE = 0x2; //添加
    const EDIT    = 0x4; //修改
    const DELETE = 0x8; //刪除

    /**
      * 角色
      */
    private $annoy = ''; //匿名用戶
    private $user   = ''; //註冊用戶
    private $admin = ''; //管理用戶
    private $usertype = 'annoy';
    private $hashtable = array(1=>'查詢',2=>'添加',4=>'修改',8=>'刪除');

    /**
      *
      */
    public function __set($name,$value)
     {
        if ($name == 'usertype')
         {
            if ($value != '')
             {
                $this->usertype = $value;
             }
         }
     }

    /**
      * 構造函數 給角色賦予權限
      */
    private function __construct()
     {
        $this->annoy = self::SELECT;
        $this->user = self::SELECT | self::CREATE;
        $this->admin = self::SELECT | self::CREATE | self::EDIT | self::DELETE;
     }

    /**
      * 獲取類的惟一實例
      */
    public static function getInstance()
     {
        if (self::$instance === null){
             self::$instance = new include_purview();
         }
        return self::$instance;
     }

    /**
      * 檢查權限
      *
      * @param $usertype 角色
      * @param $purview 權限
      */
    public function check($purview)
     {
        if ($this->{$this->usertype} & $purview)
         {
            return true;
         }
        return false;
     }

    /**
      * 給角色加權限
      */
    public function addPur($purview)
     {
        $this->{$this->usertype} |= $purview;
     }

    /**
      * 給角色減權限
      */
    public function delPur($purview)
     {
        $this->{$this->usertype} ^= $purview;
     }

    /**
      * 返回角色擁有的權限
      */
    public function getPur()
     {
        $arr = array();
        foreach ($this->hashtable as $k => $v)
         {
            if ($k & $this->{$this->usertype})
             {
                $arr[] = $v;
             }
         }
        return $arr;
     }
}

 

調用示例

 

PHP代碼

/**
* 示例
*/
//在session中讀用戶組
@session_start();
$_SESSION['role'] = 'user';

//獲取權限類的實例
$pruview = include_purview::getInstance();
//設置角色
$pruview->usertype = $_SESSION['role'];
//獲取該角色擁有的權限
$arr = $pruview->getpur();
echo '該用戶的權限有:'.join(',',$arr)."\n";
//判斷執行的操做是否有權限
if (true === $pruview->check(include_purview::CREATE ))
{
     create(); //要執行的操做
}
else
{
    exit('您沒有權限!');
}
//去掉用戶的添加權限
$pruview->delPur(include_purview::CREATE );
$arr = $pruview->getpur();
echo '該用戶的權限有:'.join(',',$arr)."\n";
//執行添加操做
if (true === $pruview->check(include_purview::CREATE ))
{
     create(); //要執行的操做
}
else
{
    echo '您沒有權限!'."\n";
}
//加上用戶的添加權限
$pruview->addPur(include_purview::CREATE );
$arr = $pruview->getpur();
echo '該用戶的權限有:'.join(',',$arr)."\n";
//執行添加操做
if (true === $pruview->check(include_purview::CREATE ))
{
     create(); //要執行的操做
}
else
{
    exit('您沒有權限!');
}

//具體的操做
function create()
{
    echo '執行了添加操做'."\n";
}