Do we need php? If we need it, which other tags should be have?
I guess that if we keep php, then we should also have javascript, and html. Aren't there any better tags we should use?
I think the php tag would make sense in some cases, for instance "Why isn't Drupal completely OOP PHP?".
Similar language-based tags would be javascript, html (and html-5?), css (css-3?) and xml. I can also imagine other technology-based tags like xml-rpc, soap, rest, apache, iis, varnish, memcached, etc. However it will always need to be specific to Drupal, otherwise it's a question for Stack Overflow, Server Fault or another SE site.
