Is it possible to have two classes with the same name if they're in different folders?

This is possible to have classes with same name even in same folder.

But Make sure you have loaded only one class in the PHP script at a time.

They can not be loaded in the same script at same time.

PHP does not know if you have created two classes with same name but the fact is PHP will not load them in same script. You can use one class at a time.

You can also look at namespaces in php.

That's where namespaces come in. http://www.php.net/manual/en/language.namespaces.rationale.php http://www.php.net/manual/en/language.namespaces.basics.php

This allows you to differentiate between the two classes of the same name.