function getQrCode(){

//获取ticket

$access_token=$this->getWxAccessToken();

$url='https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token='.$access_token;

//{"expire_seconds": 604800, "action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": 123}}}

$postArr=array(

'action_name'=>'604800',//24*60*60*7 7天时间

'action_name'=>'QR_LIMIT_SCENE',

'action_info'=>array(

'scene'=>array('scene_id'=>2000),

),

);

$postJson=json_encode($postArr);

$res=$this->http_curl($url,'post','json',$postJson);

$ticket=$res['ticket'];

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

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

}