微信小程序登录

## PHP
public function userlogin(Request $request){
      $code = $request->post("code");
      $appSecret = "********************";
      $appID = "*************";
      $url = "https://api.weixin.qq.com/sns/jscode2session?appid=%s&secret=%s&js_code=%s&grant_type=authorization_code";
      $url = sprintf($url,$appID,$appSecret,$code);

      $client = new Client(['timeout'=>5]);
      $response = $client->get($url);
      $rel = (string)$response->getBody();
//        json
      $arr = json_decode($rel,true);
// 写入数据表中
      $userInfo = Renting::openIdSet($arr['openid']);

 if(empty($userInfo)){
      $userInfo = Renting::openIdData(['openid'=>$arr['openid']]);
 }  
     return $userInfo['id'];
 }

## 小程序
    // 登录请求
    wx.login({
      timeout:2000,
      success:({code})=>{
        // code有效期是5分钟
        console.log(code);
        // 发起request请求到自己的服务器
        wx.request({
          url: 'http://www.xxx.com/index.php/userlogin',
          data: {code},
          header:{
            'Authorization':wx.getStorageSync('token')
          },
          method: 'POST',
          success:ret=>{
            console.log(ret.data)
            wx.setStorageSync('userid', ret.data)
          }
        })
      }
    })

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