PHP上传后图像变得怪异（失去所有质量）

Real image:

Image after PHP upload:

What's the explanation for that?

Those things have started to happen suddenly. I don't remember doing anything to my code. It is the same since the beginning. I'm afraid those things are happening because of the PHP version (the code is very old, kinda 2002).

P.s: The code is also big, so I want to know what part of the code should I post.

Disabling the resizing should tell you if the resizing is causing the issue.

Also note that you have a variable quality in resizeUploadedFiles make sure this is set to 100.

I'd strongly encourage the use of a framework for this such as: PHP file upload