php 利用cookie设置用户30分钟未操作自动退出

    /**
     * 系统后台 会员登录后 将会员验证内容写入对应cookie中
     *
     * @param string $name 用户名
     * @param int $id 用户ID
     * @return bool 布尔类型的返回结果
     */
    protected final function systemSetKey($user){
        setNcCookie(‘sys_key‘,encrypt(serialize($user),MD5_KEY),3600,‘‘,null);//设置cookie 过期时间为30分钟。这边设置cookie框架有带自己加密规则，具体是否需要加密自己看着设置。
    }

protected function __construct(){
        Language::read(‘common,layout‘);
        /**
         * 验证用户是否登录
         * $admin_info 管理员资料 name id
         */
        $this->admin_info = $this->systemLogin();//取得管理员的资料，之后的子类控制器继承构造方法
        if ($this->admin_info[‘id‘] != 1){
            // 验证权限
            $this->checkPermission();
        }
        //转码  防止GBK下用ajax调用时传汉字数据出现乱码
        if (($_GET[‘branch‘]!=‘‘ || $_GET[‘op‘]==‘ajax‘) && strtoupper(CHARSET) == ‘GBK‘){
            $_GET = Language::getGBK($_GET);
        }
    }

    /**
     * 系统后台登录验证
     *
     * @param
     * @return array 数组类型的返回结果
     */
    protected final function systemLogin(){
        //取得cookie内容，解密，和系统匹配
        $user = unserialize(decrypt(cookie(‘sys_key‘),MD5_KEY));//取cookie 里面储存的信息，现在使用的框架里面自定义了cookie的加密方式
        if (!key_exists(‘gid‘,(array)$user) || !isset($user[‘sp‘]) || (empty($user[‘name‘]) || empty($user[‘id‘]))){   //假如不存在说明用户没登陆或者用户长时间未操作cookie时间过期 跳到登陆页面去
            @header(‘Location: index.php?mod=login&action=login‘);exit;
        }else {
            $this->systemSetKey($user);//如果用户有登陆的话，每一个操作都会重写刷新cookie；
        }
        return $user;
    }

/**
 * 加密函数
 *
 * @param string $txt 需要加密的字符串
 * @param string $key 密钥
 * @return string 返回加密结果
 */
function encrypt($txt, $key = ‘‘){
    if (empty($txt)) return $txt;
    if (empty($key)) $key = md5(MD5_KEY);
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
    $ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
    $nh1 = rand(0,64);
    $nh2 = rand(0,64);
    $nh3 = rand(0,64);
    $ch1 = $chars{$nh1};
    $ch2 = $chars{$nh2};
    $ch3 = $chars{$nh3};
    $nhnum = $nh1 + $nh2 + $nh3;
    $knum = 0;$i = 0;
    while(isset($key{$i})) $knum +=ord($key{$i++});
    $mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum%8,$knum%8 + 16);
    $txt = base64_encode(time().‘_‘.$txt);
    $txt = str_replace(array(‘+‘,‘/‘,‘=‘),array(‘-‘,‘_‘,‘.‘),$txt);
    $tmp = ‘‘;
    $j=0;$k = 0;
    $tlen = strlen($txt);
    $klen = strlen($mdKey);
    for ($i=0; $i<$tlen; $i++) {
        $k = $k == $klen ? 0 : $k;
        $j = ($nhnum+strpos($chars,$txt{$i})+ord($mdKey{$k++}))%64;
        $tmp .= $chars{$j};
    }
    $tmplen = strlen($tmp);
    $tmp = substr_replace($tmp,$ch3,$nh2 % ++$tmplen,0);
    $tmp = substr_replace($tmp,$ch2,$nh1 % ++$tmplen,0);
    $tmp = substr_replace($tmp,$ch1,$knum % ++$tmplen,0);
    return $tmp;
}

/**
 * 解密函数
 *
 * @param string $txt 需要解密的字符串
 * @param string $key 密匙
 * @return string 字符串类型的返回结果
 */
function decrypt($txt, $key = ‘‘, $ttl = 0){
    if (empty($txt)) return $txt;
    if (empty($key)) $key = md5(MD5_KEY);

    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
    $ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
    $knum = 0;$i = 0;
    $tlen = @strlen($txt);
    while(isset($key{$i})) $knum +=ord($key{$i++});
    $ch1 = @$txt{$knum % $tlen};
    $nh1 = strpos($chars,$ch1);
    $txt = @substr_replace($txt,‘‘,$knum % $tlen--,1);
    $ch2 = @$txt{$nh1 % $tlen};
    $nh2 = @strpos($chars,$ch2);
    $txt = @substr_replace($txt,‘‘,$nh1 % $tlen--,1);
    $ch3 = @$txt{$nh2 % $tlen};
    $nh3 = @strpos($chars,$ch3);
    $txt = @substr_replace($txt,‘‘,$nh2 % $tlen--,1);
    $nhnum = $nh1 + $nh2 + $nh3;
    $mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum % 8,$knum % 8 + 16);
    $tmp = ‘‘;
    $j=0; $k = 0;
    $tlen = @strlen($txt);
    $klen = @strlen($mdKey);
    for ($i=0; $i<$tlen; $i++) {
        $k = $k == $klen ? 0 : $k;
        $j = strpos($chars,$txt{$i})-$nhnum - ord($mdKey{$k++});
        while ($j<0) $j+=64;
        $tmp .= $chars{$j};
    }
    $tmp = str_replace(array(‘-‘,‘_‘,‘.‘),array(‘+‘,‘/‘,‘=‘),$tmp);
    $tmp = trim(base64_decode($tmp));

    if (preg_match("/\d{10}_/s",substr($tmp,0,11))){
        if ($ttl > 0 && (time() - substr($tmp,0,11) > $ttl)){
            $tmp = null;
        }else{
            $tmp = substr($tmp,11);
        }
    }
    return $tmp;
}