(as you are mod'ed Funny, I'm not entirely sure if your sarcastic or really unknowing)
This is honestly one of the most idiotic and ignorant thing to say about PHP. PHP has it's quirks, and wierdnesses. But it's not any less of a language or platform then anything else.
It did not have any special facilities or out-of-the-box features, prior to 5.3. But it has had FastCGI support for ages. It's honestly the only requirement you really want to scale PHP. You can deploy as many PHP workers as you like. Combined with a shared or replicated webroot and database, you have a really simple and SOLID scale path.
Now when 5.3 is getting more and more deployed we also have PHP-FPM. A dedicated and officially supported process manager to pool and manage php workers. Just like FastCGI, it's architecture is super simple, and a blast to work with. One of the additions is "per pool php.ini", were you run the same instance of the manager but with entirely different PHP environments.
Remember, the PHP philosophy has always been KISS, "Keep It Simple, Stupid". PHP in it self is just the language and runtime. Scaling is deliberately left outside of the core, and developed by people more skilled in that particular area. (Ok ok, its not entierly seperated from the core. PHP-FPM had some minor changes made to the 5.3 codebase to cater for their architecture).