【求助】PHP下如何使用微博床图

找到一篇关于微博床图的文章
http://www.jianshu.com/p/55fd...
具体是用python来实现的
我想要在php下来实现,具体实现代码如下:

        $post_data['pic1']=curl_file_create('d:/gg.jpg', 'image/jpeg', "gg.jpg");
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "http://picupload.service.weibo.com/interface/pic_upload.php?mime=image%2Fjpeg&data=base64&url=0&markpos=1&logo=&nick=0&marks=1&app=miniblog");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie); 
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
        $output = curl_exec($ch);
        curl_close($ch);
        print_r($output);

但一直失败,不知道为什么?

{"code":"A20001","data":{"count":-1,"data":"eyJhcHAiOiJtaW5pYmxvZyIsImNvdW50IjotMSwidGltZSI6MTQ4NjE5NzM4OC43NjMsInBpY3MiOnsicGljXzEiOnsicmV0IjotMSwibmFtZSI6InBpY18xIn19fQ==","pics":{"pic_1":{"ret":-1,"name":"pic_1"}}}}

1.$cookie内容来自:

2.$post_data['pic1']中的pic1来自:

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