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Although I don’t quite understand. But you invited me to answer. Let me simply talk about my thoughts: the variables of your urlencode() and urldecode() are different, and they must be impossible to obtain. What do you think of my statement?

Look at the hear information of this picture http request

Owner, you are not very good at using phpqrcode.
http://www.cnblogs.com/rainbl...

The first parameter is the QR code content, and the second parameter is the saving path of the generated png image. You should just introduce the saved path into the img tag after generating it.