uni-app结合PHP实现单用户登陆demo及解析

//初始化
socket.on('init', () => { //连接初始化
    socket.send({
        type: 'login',
        token: uni.getStorageSync('access_token'),
        device_no: plus.device.uuid,            //手机设备唯一编号
    });
}).on('quit_push',(res)=> {
    if(res) {
        uni.showModal({
            title: '退出通知',
            content: '你的账号在其他设备上登录！',
            showCancel: true,
            cancelText: '取消',
            confirmText: '确定',
            success: res => {
                if(res.confirm) {
                    uni.clearStorageSync()
                    store.commit('chat/clear')
                    uni.reLaunch({
                        url:"../../pages/login/index"
                    })
                }else if(res.cancel) {
                    uni.clearStorageSync()
                    store.commit('chat/clear')
                    uni.reLaunch({
                        url:"../../pages/login/index"
                    })
                }
            }
        });
    }
});

$is_online = Db::name('UserLoginClient')->where('user_id',$user['id'])->order('id desc')->find();
if(isset($device_no) && $device_no && $is_online['device_no'] != $device_no && !empty($is_online['device_no'])) { 
        Tools::sendToClient($is_online['client_id'],json_encode([
                                                                                                'type' => 'quit_push',
                                                                                                'data' => 'ip',
                                                                                                'message' => '强制下线'
                                                                                            ]));
            }

public static function sendToClient($client_id, $message)
    {
        Gateway::sendToClient($client_id, $message);
    }

if (self::$headToken && Cache::has(self::$prefix . self::$userId)) {
            if (self::$headToken == Cache::get(self::$prefix . self::$userId)) {
                Cache::set(self::$prefix . self::$userId, self::$headToken, self::$timeOut);
            } else {        // 换了手机,客户端重新发送pushtoken到服务端，服务端与缓存中的pushtoken比较，不同则给原来pushtoken手机推送一条并重新缓存新的token
                // modify by wensen on 20180816
                // $addr = getCity();
                $addr = getMobCity();
                $ip = request()->ip();
                if ($addr) {
                    $addr['province'] = empty($addr['province']) ? '' : $addr['province'];
                    $addr['city'] = empty($addr['city']) ? '' : $addr['city'];
                    // $address = "\t" . $addr['country'] . "-" . $addr['region'] . "-" . $addr['city'] . " (IP:" . $ip . ")\t";
                    $address = "\t" . $addr['country'] . "-" . $addr['province'] . "-" . $addr['city'] . " (IP:" . $ip . ")\t";
                } else {
                    $address = "IP:" . $ip . "";
                }
                $OldToken = Cache::get(self::$prefix . self::$userId);
                if (strlen($OldToken) == 64) {
                    $content = array(
                        'title' => 'APP紧急通知',
                        'body' => '您的账号于:' . date('Y-m-d H:i:s') . '在' . $address . '处登录,若不为您本人登录,请您立即修改密码!',
                        'pull_service' => 'login'
                    );
                    \umeng\Push::send($OldToken, 'unicast', $content, 'message', true);
                } elseif (strlen($OldToken) == 44) {
                    $content = array(
                        'pull_service' => 'login',
                        'msg' => '您的账号于:' . date('Y-m-d H:i:s') . '在' . $address . '处登录,若不为您本人登录,请您立即修改密码!'
                    );
                    \umeng\Push::send($OldToken, 'unicast', $content, 'message', true);
                }
                Cache::set(self::$prefix . self::$userId, self::$headToken, self::$timeOut);
            }
        } else {
            Cache::set(self::$prefix . self::$userId, self::$headToken, self::$timeOut);
        }