May I ask Sina Weibo or other UGC application, picture upload here have what need to pay attention to the pit?

In fact, I do not understand how to do this, ask how these several requests are carried out.
The image below is a micro-blog to publish multiple images of the request, figure two is the parameters involved in the request. How is this pic_id generated, for example? What is the purpose of doing this?

Thank you in advance!

Reply content:

In fact, I do not understand how to do this, ask how these several requests are carried out.
The image below is a micro-blog to publish multiple images of the request, figure two is the parameters involved in the request. How is this pic_id generated, for example? What is the purpose of doing this?

Thank you in advance!

Generated by calling the Http://open.weibo.com/wiki/2/statuses/upload_pic interface, this is an advanced interface.

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