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So I have an idea, but I’m thinking I need to run it by StackOverflow before I do something stupid.
I want to have an associative array of class names => filepaths. If PHP ever runs into a fatal error where the class is not defined, it will check if the key exists in my array and then require_once the class. This will prevent unnecessary bulk loading of classes that may never be used.
Bad idea?
Autoloading is the right way to do it, but spl_autoload_register is a cleaner way than __autoload, because it allows multiple autoloaders. Function __autoload also AFAIK stops working when spl_autoload_register is called, unless __autoload is also registered.
You can write your own autoload or use an existing one. For example, Zend Framework has an autoloader that uses conventions (Foo_Bar is in Foo/Bar.php). Nette Framework has RobotLoader, that indexes your classes and uses the index when neccessary. However, unless you use other things from the framework, it is probably too large.
see: http://www.php.net/manual/en/function.spl-autoload-register.php