class WeChat{

    private $_appid;

    private $_appsecret;

    private $_token;

    public function __construct($_appid,$_appsecret,$_token){

        $this->_appid = $_appid;

        $this->_appsecret = $_appsecret;

        $this->_token = $_token;

    }

    /**

     * 获取页面内容

     * @params $curl   URL

     * @params $https  传输协议

     * @params $method 请求方法

     * @params $data   传输的数据

     */

    public function _request($curl,$https=true,$method='GET',$data=null){

        $ch = curl_init();//初始化

        curl_setopt($ch,CURLOPT_URL,$curl);//URL

        curl_setopt($ch,CURLOPT_HEADER,false);//

        curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);

        if($https){

            curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);

            curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,true);

        }

        if($method == 'POST'){

            curl_setopt($ch,CURLOPT_POST,true);

            curl_setopt($ch,CURLOPT_POSTFIELDS,$data);

        }

        $content = curl_exec($ch);

        curl_close($ch);

        return $content;

    }

    /**

     * 获取accesstoken

     */

    public function _getAccessToken(){

        $file = './accesstoken';

        if(file_exists($file)){

            $content = file_get_contents($file);

            $content = json_decode($content);

            if(time() - filemtime($file)<$content->expires_in){

                return $content->access_token;

            }

        }

        $curl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->_appid."&secret=".$this->_appsecret;

        $content = $this->_request($curl);

        file_put_contents($file,$content);

        $content = json_decode($content);

        return $content->access_token;

    }

    /**

     * 获取二维码 1、获取ticket

     * @params $sceneid 场景id

     * @params $type    类型：临时/永久

     * @params $expire_seconds 过期时间604800 7天

     */

    public function _getTicket($sceneid,$type='temp',$expire_seconds=604800){

        if($type == 'temp'){

            $data = '{"expire_seconds": %s, "action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": %s}}}';

            $data = sprintf($data,$expire_seconds,$sceneid);//格式化输出

        }else{

            $data = '{"action_name": "QR_LIMIT_SCENE", "action_info": {"scene": {"scene_id": %s}}}';

            $data = sprintf($data,$sceneid);

        }

        $curl = 'https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token='.$this->_getAccessToken();

        $content = $this->_request($curl,true,'POST',$data);

        $content = json_decode($content);

        return $content->ticket;

    }

    /**

     * 获取二维码 1、获取二维码QRCode

     * @params $sceneid 场景id

     * @params $type    类型：临时/永久

     * @params $expire_seconds 过期时间604800 7天

     */

    public function _getQRCode($sceneid,$type = 'temp',$expire_seconds=604800){

        $ticket = $this->_getTicket($sceneid,$type,$expire_seconds);

        $content = $this->_request('https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket='.urlencode($ticket));

        return $content;

    }

}

$wechat = new WeChat('wxb7e7af838ec6bed2','d4624c36b6795d1d99dcf0547af5443d','');

//echo $wechat->_request("https://www.baidu.com");//获取页面内容

//echo $wechat->_getAccessToken();//获取accesstoken

header('Content-type:image/jpeg');

echo $wechat->_getQRCode(30);