PHP实现用户在线状态检测

这个是基于ThinkPHP框架的，其他的可以自己根据需求改

1.先新建一个tags.php文件，放在配置目录Conf下。

<?php
 /*
 * 添加行为
 *
 */
 return array(
    'action_begin' => array('OnlineCheck'),
 );
 ?>

2.定义具体的功能

<?php
 /*
 * 定义行为: 在线更新
 */
 class OnlineCheckBehavior extends Behavior {
    //行为参数
    protected $options = array(
        'ONLINE_CHECK' => true, // 默认进行在线
        'ONLINE_CHECK_TIME' => 10, // 默认5分钟未活动，说明已下线
    );
    public function run(&$params) {
        if (C('ONLINE_CHECK')) {
            // 更新session
            if ((session('?login_account')) && (time() - session('access_time') > 60)) {
                session('access_time', time());
            }
            // 在线更新
            $ip = ip2long(get_client_ip());
            $online = M('Online');
            // 先删除在线表中 超过5分钟未活动的记录
            //$sql = ' delete from __TABLE__  where  ';
            $map['lasttime'] = array('lt', time() - C('ONLINE_CHECK_TIME') * 60);
            $icount = $online->where($map)->delete();
            if (session('?login_account')) { // 如果是登录用户
                $map = array();
                $map['uid'] = session('login_uid');
                $map['lastip'] = $ip;
                $id = $online->where($map)->getField('id');
                if (empty($id)) { // 不存在在线记录，则清空session
                    session(null);
                } else {
                    $map = array();
                    $map['id'] = array('eq', $id);
                    $data['lasttime'] = time();
                    $data['lastip'] = $ip;
                    $online->where($map)->save($data);
                }
            } else { // 不是登录用户  游客
                unset($map);
                $map['lastip'] = array('eq', $ip);
                $id = $online->where($map)->getField('id');
                //dump($id);
                if (empty($id)) { // 不存在在线记录， 则添加
                    $data = array();
                    $data['uid'] = 0;
                    $data['account'] = 'Guest';
                    $data['nickname'] = '游客';
                    $data['lasttime'] = time();
                    $data['lastip'] = $ip;
                    $online->add($data);
                } else {
                    $map = array();
                    $map['id'] = array('eq', $id);
                    $data['lasttime'] = time();
                    $data['lastip'] = $ip;
                    $online->where($map)->save($data);
                }
            }
        }
    }
 }
 ?>

3.在具体的登录方法上添加

// 登录检测
    public function checkLogin() {
        // $this->redirect($url);
        $username = strtolower($this->_param('usr'));
        $pwd = $this->_param('pwd');
        $url = $this->_param('url'); // 目标地址
        $is_error = false;
        if (empty($username) or empty($pwd)) {
            $this->assign('error_msg', '用户名和口令不能为空');
            $is_error = true;
        }
        if (!$is_error) {
            $model = M('Usr');
            $map['account'] = $username;
            $map['upwd'] = strtoupper(md5($pwd));
            $icount = $model->where($map)->count();
            if ($icount == 1) {
                $list = $model->where($map)->find();
                // 检测用户是否在线
                if ($this->isOnline($list['id'])) {
                    // <editor-fold defaultstate="collapsed" desc="if开始">
                    if ($list['status']) {
                        session('login_account', $username);
                        session('login_nickname', $list['nickname']);
                        session('last_time', toDate($list['last_time']));
                        if ($list['last_ip']) {
                            session('last_ip', long2ip($list['last_ip']));
                        } else {
                            session('last_ip', get_client_ip());
                        }
                        session('login_count', $list['login_count']);
                        session('login_uid', $list['id']);
                        session('login_pwd', $list['upwd']);
                        session('access_time', time());  //用户最后点击页面时间  session超时使用
                        ///
                        $map['id'] = $list['id'];
                        $data['last_time'] = time();
                        $data['last_ip'] = ip2long(get_client_ip());
                        $model->where($map)->save($data);
                        $model->where($map)->setInc('login_count', 1);
                        // 检测是否有同一IP的记录，有更新，否则 添加
                        $online = M('Online');
                        $map = array();
                        $map['lastip'] = ip2long(get_client_ip());
                        $online_id = $online->where($map)->getField('id');
                        if (empty($online_id)) {
                            // 插入在线用户表
                            $data = array();
                            $data['uid'] = $list['id'];
                            $data['account'] = $list['account'];
                            $data['nickname'] = $list['nickname'];
                            $data['lasttime'] = time();
                            $data['lastip'] = ip2long(get_client_ip());
                            $online->add($data);
                        }else{
                             // 更新在线用户表
                            $data = array();
                            $data['uid'] = $list['id'];
                            $data['account'] = $list['account'];
                            $data['nickname'] = $list['nickname'];
                            $data['lasttime'] = time();
                            //$data['lastip'] = ip2long(get_client_ip());
                            $online->where($map)->save($data);
                        }
                    } else {
                        $is_error = true;
                        $this->assign('error_msg', '此用户已被禁止登录！');
                    }
                    // </editor-fold>   if 结束
                } else {
                    $is_error = true;
                    $this->assign('error_msg', '此用户名已在其他电脑登陆,请' . C('ONLINE_CHECK_TIME') .'分钟后再试！');
                }
            } else {
                $is_error = true;
                $this->assign('error_msg', '错误的用户名或口令！');
            }
        }
        if ($is_error) {
            $this->display('login');
        } else {
            $this->redirect('Index/index');
 //            if (empty($url)) {
 //                $this->redirect('Index/index');
 //            } else {
 //                $this->redirect($url);
 //            }
        }
    }
  /**
     * 检测用户是否在线
     * @access private
     * @param int $uid 用户ID
     * @return Boolean true=不在线
     */
    private function isOnline($uid) {
        $ip = ip2long(get_client_ip());
        $online = M('Online');
        $map['uid'] = array('eq', $uid);
        $list = $online->where($map)->find();
        if (empty($list)) { // 不存在
            return true;
        } else { // 存在，检测IP是否一致，否则，检测是否超过5分钟
            if ($list['lastip'] == $ip) {
                return true;
            } else {
                if ($list['lasttime'] < time() - C('ONLINE_CHECK_TIME') * 60) {
                    return true;
                } else {
                    return false;
                }
            }
        }
    }

以上就是具体的PHP在线状态检测，同一时间只有一个用户可以存在，不过还没有考虑到非正常掉线等，cookie，session意外的处理，但是先分享出来吧，以后改进了再说。呵呵