Is it because PHP isn't considered a "serious" language, and is mostly the realm of "designers" and "script kiddies"?
Do the developers who visit this site all code in Ruby, Erlang or Objective-C? Are PHP developers a minority in this community?
I play with Ruby & Objective-C on my own time, but at work it's an all PHP shop. We primarily use the Zend Framework, and honestly it's pretty good (good enough for IBM...). With the recently announced build tools, and some of the classes we've developed on top of ZF, I can develop just as quickly in PHP as I can with RoR.
PHP is also fairly popular with successful startups. Larger sites like Digg, Flickr and Facebook are using at least some PHP to scale to fairly massive traffic; even Wufoo (a site which I feel represents what so many of us here are trying to achieve in essence) is written in PHP.
I will agree that PHP is a bit of a mess (backslashes for namespaces?), and that the internet is full of the wrong way to use it; however, there certainly are talented developers writing quality software in PHP. Is there no interest in that here?
Apologies if this is a rehash of a tired topic; I poked around for a few minutes and didn't see anything relevant/recent.