微信公众发ticket取得二维码图并发微信素材获得media_id..求PHP代码??

//换取二维码
$ticket=urlencode($ticket);
$url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket={$ticket}";
//保存到sae
$file= file_get_contents($url);
$data = array (
"foo"=>"bar",
'upload' => '@'.$file.'.jpg');
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url1);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch,CURLOPT_POSTFIELDS,$data);
curl_getinfo($ch);
$return_data = curl_exec($ch);
curl_close($ch);

private function receiveEvent($object)
{
$contentStr = "";
switch ($object->Event)
{
case "subscribe":
$contentStr = "欢迎 ";
if (isset($object->EventKey)){
$contentStr = "关注二维码场景 ".$object->EventKey;
}
break;
case "SCAN":
$contentStr = "扫描 ".$object->EventKey;
//要实现统计分析，则需要扫描事件写入数据库，这里可以记录 EventKey及用户OpenID，扫描时间
break;
default:
break;

}
$resultStr = $this->transmitText($object, $contentStr);
return $resultStr;

没看懂什么意思？