[giusc]

Look at the php.net website source code. Another example could be the Wordpress source code. It's not handsome code, but it just works.

Things like fat (either slim) frameworks should be memory resident (java or similar), not reloaded from scratch at each web request, it just won't never perform on big sites. Alternatively, if you need to deal with bigger applications, or massive traffic, you can build some kind of backend memory resident application (c, c++, java, go...) and delegate the hard work to it by using a lightweight rpc protocol (see messagepack, thrift, protobuf), and leave PHP alone to do the job it's born for.

Also, the choice to adopt a framework is serious stuff, it firstly should be well designed and maintained, then it should suit exactly your needs and more importantly you should not just use it, but learn conventions and write your code by sticking on them or else all your code will result in a bad mess.

[eropple]

Wordpress is "not handsome code" and has been the source of massive security holes for a decade.

Symfony has problems, to be sure, but it at least establishes certain levels of sanity that you have to do something stupid to break.

[p4lindromica]

Any "big site" will use an opcode cacher like XCache or APC to avoid reloading .php files from disk on every request.

[chipotle_coyote]

Honest question: while I know that's true (I was using APC, now using Zend Opcode or whatever the replacement in PHP 5.5 is whose name escapes me at the moment), it seems to me that there's still going to be a performance penalty incurred. The PHP may be all compiled to bytecode at that point and the bytecode may be 100% memory resident, but you're running through all the initialization routines for the framework on each and every page hit.

"Pure" PHP is a pretty fast language when benchmarked, but PHP frameworks tend to benchmark poorly, and I've always assumed that the overhead incurred by PHP's execution model is the culprit -- essentially, PHP was written with assumptions about How Dynamic Web Sites Work that made sense in the late '90s but really suck when every request is hitting a front controller and being dispatched through a router. Is this not the case?

[pedro93]

Yes you can use APC, opcache or XCache to load php bytecode in runtime. but you are still calling php functions/methods or creating a lot of objects in runtime. that's the overhead.