php 生成公众号二维码

    //临时二维码
    public function getQrls()
    {
        $user = $this->auth->getUserinfo();
        $src = Cache::get('srcimg');
        if (!empty($src)) {
            $this->success('成功', ['img' => $src]);
        }
        $user_model = new \app\admin\model\User();
        $userOpenid = $user_model->where('id',$user['id'])->value('openid');
        $accessToken = Cache::get('access_token');
        if (!$accessToken){
            $accessToken = $this->_getWxAccessToken($userOpenid);
        }

        $url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=".$accessToken;
        $postArr =  [
            "action_name" => "QR_SCENE",
            "expire_seconds" => 604800,
            "action_info" => [
                'scene' => ['scene_id' => 2000],
            ],
        ];

        $postJson = json_encode($postArr);
        $res = $this->ch($url, 'post', 'json', $postJson);

        $ticket = $res['ticket'];
        $url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=".urlencode($ticket);

        $src = "<img src='".$url."' alt='关注公众号' width='100%'>";
        Cache::set('srcimg',$src,600000);
        $this->success('成功', ['img' => $src]);

    }

    //永久二维码
    public function getQryj()
    {
        $accessToken = $this->_getWxAccessToken();
        $url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token={$accessToken}";
        $postArr =  [
            "action_name" => "QR_LIMIT_SCENE",
            "action_info" => [
                'scene' => ['scene_id' => 3000],
            ],
        ];

        $postJson = json_encode($postArr);
        $res = $this->ch($url, 'post', 'json', $postJson);

        $ticket = $res['ticket'];
        $url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=".urlencode($ticket);

        echo "<img src='".$url."'>";
    }

    //url请求
    private function ch($url, $type='get', $res='json', $arr='')
    {

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

        if ($type == 'post') {
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $arr);
        }

        $cnt = curl_exec($ch);
        if (curl_errno($ch)) {
            return ;
        }

        curl_close($ch);
        if ($res == 'json') {
            return json_decode($cnt, true);
        }

        return $cnt;
    }

    private function _getWxAccessToken($appid){
        $url ="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=". Config::get("wechat.AppId") ."&secret=". Config::get("wechat.AppSecret");
        $data = $this->ch($url,'get');
        Cache::set('access_token',$data['access_token'],7100);
        return $data['access_token'];
    }