create permalink

That’s an excellent documentation what a permalink is, but it doesn’t help at all (or at least I didn’t see anything that would help)

I want to know, how I can create permalinks for WP with php myself, hope that anyone can help me.

Thanks for your effort, but I think you didn’t understood my question …
I don’t want to know what a permalink is or how you can create it in generally.

WP creates a permalink according to the data from the permalink_structure defined in the admin panel and the data from the blogposts. I want to know, which function creates these permalinks in WP!