Okay I'm not trying to start a comment war or anything, but Im struggling. I want to learn PHP but im already great with python and can just learn flask.. Is there any advantages to learn both because I probably will do that I just wanted to hear some opinions.

In my opinion it's always good to know many programming languages. It helps you for future projects to select the right/best tool (language) for it.

Its always good to learn more man. If anything, knowing other stacks can make you consider and approach your current stack differently. So i say go for it.

Go for it, I've found working with different languages can somehow make you think differently on how to approach other things.

Learn both, experience with as much as possible will be helpful.

Learn PHP7, don't even bother with 5 or below.

@PrivateGER I was planning on it

I learnt PHP and even built a whole web shop on it. Then I realized it was quite a shitty language. Though even though I'm a full stack developer mostly working with Javascript I've actually found PHP enormously good to know. WordPress is still a big thing, and many web agencies still deliver in PHP. It's a good language to know, since it won't really die in a long time.

TLDR;
Go ahead! Learn PHP!