PHP实现微信扫码登录功能的两种方式总结

$redirect_uri="http://你的微信开放平台绑定域名下处理扫码事件的方法";
$redirect_uri=urlencode($redirect_uri);//该回调需要url编码
$appID="你的appid";
$scope="snsapi_login";//写死，微信暂时只支持这个值
//准备向微信发请求
$url = "https://open.weixin.qq.com/connect/qrconnect?appid=" . $appID."&redirect_uri=".$redirect_uri
."&response_type=code&scope=".$scope."&state=STATE#wechat_redirect";
//请求返回的结果(实际上是个html的字符串)
$result = file_get_contents($url);
//替换图片的src才能显示二维码
$result = str_replace("/connect/qrcode/", "https://open.weixin.qq.com/connect/qrcode/", $result);
return $result; //返回页面

<script src="https://res.wx.qq.com/connect/zh_CN/htmledition/js/jquery.min.js"></script>
<script  src="http://res.wx.qq.com/connect/zh_CN/htmledition/js/wxLogin.js"></script>

<div id="wx_login_container"></div>

<script>
 
$(document).ready(function()
{
    var obj = new WxLogin({
        self_redirect: true,
        id:"wx_login_container",
        appid: "appid",
        scope: "snsapi_login",
        redirect_uri: "回调地址",//这里的回调地址可以写后端的接口，也可以写前端的页面地址，我这里写的是前端的页面地址
        state: "",
        style: "black",
        href: "", //https://某个域名下的css文件
     });
});
// 将方法挂载到window主链上
        // 从iframe中获取到回调函数中获取的微信返回的code
        window.jumpTop = function(code){
            console.log(code);
            var data = {
                code: code
            };
            console.log(data);
            self.axios
                .post("/index.php/xxx/wxlogin_notice", data)
                .then(result => {
                    if(result.data.code > 0)
                    {
                        Message.success(result.data.msg);
                        if(result.data.type == 0)
                        {// 跳学生首页
                            self.$router.push("/manager/student/reportList");
                        }
                        else if(result.data.type == 1 || result.data.type == 9)
                        {// 跳选择身份页
                            self.$router.push("/manager/teacher/index");
                        }
                    }
                })
                .catch(err => {});/
    public function wxlogin_notice(Request $request)
    {
        $code = $request->input("code");
        if (!empty($code)) 
        {
            $jsonResult = '';
            if($jsonResult == '')
            {
                //通过code获得 access_token + openid
                $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" . $this->appid . "&secret=" . $this->appsecret . "&code=" . $code . "&grant_type=authorization_code";
                $jsonResult = file_get_contents($url);
            }
            // 对象转数组
            $resultArray = json_decode($jsonResult, true);
            $access_token = $resultArray["access_token"];
            $openid = $resultArray["openid"];
            //通过access_token + openid 获得用户所有信息,结果全部存储在$infoArray里,后面再写自己的代码逻辑
            $infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" . $access_token . "&openid=" . $openid;
            $infoResult = file_get_contents($infoUrl);
            $infoArray = json_decode($infoResult, true);
            // 没有unionid ，跳官网
            if (!isset($infoArray['unionid'])) 
            {
                // echo "<script >alert('登录失败，用户信息错误！')</script>";die;
                $result['code'] = -1;
                $result['msg'] = '登录失败，用户信息错误！';
                return $result;
            }
            // 获取unionid
            $unionid = $infoArray['unionid'];
            $userinfo = DB::table('user')->where('unionid', $unionid)->first();
            $userinfObj = json_decode(json_encode($userinfo), true);
            if ($userinfo) 
            {
                // 存session
                $request->session()->put('userinfo', $userinfObj);
 
                // $session = $this->getSession($request);
                // var_dump($session);die;
 
                // 教师跳页
                if (($userinfo->type == 9) || ($userinfo->type == 1 && $userinfo->islogin == 9)) 
                {
                    // echo "<script> top.location.href='https://www.xxxx.net/'; </script>";die;
                    $result['code'] = 1;
                    $result['msg'] = '登录成功';
                    $result['type'] = $userinfo->type;
                    return $result;
                } 
                else if ($userinfo->type == 1 && $userinfo->islogin >= 3) 
                { // 学生跳页
                    // echo "<script> top.location.href='https://www.xxxx.net/'; </script>";die;
                    $result['code'] = 2;
                    $result['msg'] = '登录成功';
                    $result['type'] = $userinfo->type;
                    return $result;
                }
                else if($userinfo->type == 0)
                {
                    // echo "<script> top.location.href='https://www.xxxx.net/'; </script>";die;
                    $result['code'] = 3;
                    $result['msg'] = '登录成功';
                    $result['type'] = $userinfo->type;
                    return $result;
                }
                else 
                { // 无效用户跳至官网
                    // echo "<script> top.location.href='https://www.xxxx.net'; </script>";die;
                    $result['code'] =-2;
                    $result['msg'] = '用户身份有误！';
                    return $result;
                }
            } 
            else 
            {
                // echo "<script >alert('登录失败，用户信息错误~')</script>";die;
                $result['code'] = -3;
                $result['msg'] = '用户身份有误！';
                return $result;
            }
        } 
        else 
        {
            // echo "<script >alert('登录失败，请重试！')</script>";die;
            $result['code'] = -4;
            $result['msg'] = '登录失败，请重试！';
            return $result;
        }
    }