Part of the core code of IT Fun Things Network is open: How to add your own logo at the bottom of the picture

The IT Fun Facts website is online. I hope it can bring you a little fun when you are under great pressure.
Our website is: http://itqushi.com/
We are committed to the fun of IT workers.
No more nonsense.
As a picture sharing site, many websites will add their own logos below the pictures after uploading them. After a long period of testing, I finally wrote these codes.
(ps: I'm sorry, I work in Java, so it's a bit laborious to study PHP)
As my advertising fee for promoting our website, I give this code that many people want. (Don’t criticize me, you can optimize the code better)

The following is just the prototype that has been researched, that is, the code to generate the effect of the picture. As for how to use it, major webmasters can modify it themselves.