WampServer

I've installed the Wampserver and when I open a project it shows all the classes code when I call them through a -require- and it doesn't either work when I want to include a php file. The rest works, such as localhost, phpmyadmin,... and when there is no php code. It doesn't say any error, just the code. It happens from I changed the old version for the new one. I uninstalled the old one before and erased the directory as the instructions say. Thank you for your help!

It's been solved. It was as the same Camel's problem about tags. In php.ini, short_open_tag must be On, not Off.