Because the best way to browse the enormous PHP site is via Google search. Type in your query and Google will point you to the specific page you are looking for.
The PHP site doesn't need a massive facelift, but honestly, this is actually a bit of a problem. The site is basically just a hosting of the resources already, why not make it easier to find things from inside the site?
- The first thing the user sees is a massive wall of text. The whole site looks visually cluttered. Everything is arranged haphazardly.
- The more useful parts (e.g. the introduction, documentation links, download links) are hidden away in small corners of the site.
- The relatively useless Events and News sections take up >80% of the site.
Python's site looks slightly better, but not by much.