微信企业号-网页授权

 企业公众号-网页授权，微信官方文档

 //网页授权获取用户信息
 /*访问方式
         获取code：js--location.href='http://xxx/api/wxapi/wxapi?redirect_uri='+urlencode('http://xxx/api/wxapi/wxapi')+'&backurl=urlencode(返回到前台地址)';
         获取用户信息：js--ajax='http://xxx/api/wxapi/wxapi?code=code&getinfo=getinfo'

         */
    public function wxapi()
    {
       
        //判断请求方式
        if ($this->isHttps()) {
            $protocol = 'https';
        } else {
            $protocol = 'http';
        }

        //初始化变量
        $appid = 'xxx';
        $secret= 'xxx';
        $scope = 'snsapi_userinfo';
        $state = 'STATE';
        $code = '';
        $redirect_uri = $protocol . '://' . $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
        $device = '';
        $authUrl='https://open.weixin.qq.com/connect/oauth2/authorize';
        $back_url='';
        //回调地址
        if (isset($_GET['back_url'])) {
            $back_url = urldecode($_GET['back_url']);
        }
        //code返回本页面
        if(isset($_GET['redirect_uri'])){
            $redirect_uri=urldecode($_GET['redirect_uri']);
        }
        //appid
        if (isset($_GET['appid'])) {
            $appid = $_GET['appid'];
        }
        if (isset($_GET['secret'])) {
            $secret = $_GET['secret'];
        }
        if (isset($_GET['state'])) {
            $state = $_GET['state'];
        }
        //临时令牌
        if (isset($_GET['code'])) {
            $code = $_GET['code'];
        }
        //授权方式
        if (isset($_GET['scope'])) {
            $scope = $_GET['scope'];
        }

        //获取用户信息
        if(!empty($_GET['getinfo']) && $_GET['getinfo']=="getinfo"){
            
            //https://qyapi.weixin.qq.com/cgi-bin/user/getuserinfo?access_token=ACCESS_TOKEN&code=CODE
            //获取网页access_token，

            $access_token = file_get_contents("https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={$appid}&corpsecret=$secret");
            $token=json_decode($access_token,1);
            if(isset($token['errcode']) && $token['errcode']!=0){
                $this->content=$token;
                $this->errorInfo(2);
            }
            $arr=file_get_contents('https://qyapi.weixin.qq.com/cgi-bin/user/getuserinfo?access_token='.$token['access_token'].'&code='.$code);
            $arr=json_decode($arr,1);
            if(isset($arr['UserId'])){
                $arr=file_get_contents('https://qyapi.weixin.qq.com/cgi-bin/user/get?access_token='.$token['access_token'].'&userid='.$arr['UserId']);
                $arr=json_decode($arr,1);
            }
            $this->content=$arr;
            $this->errorInfo(0);
        }

        if (empty($code)) {

            //访问地址
            if (isset($_GET['authUrl'])) {
                $authUrl = $_GET['authUrl'];
            }

            //回调地址【微信中间件地址】
            $options = [
                $authUrl,
                '?appid=' . $appid,
                '&redirect_uri=' . urlencode($redirect_uri),
                '&response_type=code',
                '&scope=' . $scope,
                '&agentid=47',
                '&state=' . $state,
                '#wechat_redirect',
            ];

            //把redirect_uri先写到cookie
            setcookie('redirect_uri', urlencode($back_url));
            header('Location: ' . implode('', $options));echo 123;die;
        } else {

            //查回调地址
            if (isset($_COOKIE['redirect_uri'])) {
                $back_url = urldecode($_COOKIE['redirect_uri']);
            }
            if(empty($back_url)){
                die('参数 back_url 不能为空,请重新访问');
            }
            
            if(strpos($back_url,'/#')){
                $aa=(strpos($back_url,'/#')-1);
                if($back_url[$aa]=='/'){
                     $back_url=substr($back_url,0,$aa).substr($back_url,($aa+1));;
                };
            }
             //返回code
             //跳转到回调页面
            header('Location: ' . implode('', [
                $back_url,
                strpos($back_url, '?') ? '&' : '?',
                'code=' . $code,
            ]));echo 456;die;
        }

    }
    private function isHttps()
    {
        if (!isset($_SERVER['HTTPS'])) {
            return false;
        }

        //判断服务器类型
        if ($_SERVER['HTTPS'] === 1) {
            //Apache
            return true;
        } elseif ($_SERVER['HTTPS'] === 'on') {
            //IIS
            return true;
        } elseif ($_SERVER['SERVER_PORT'] == 443) {
            //其他
            return true;
        }
        return false;
    }