PHP-GTK 2 (currently under development) is based on PHP 5 and Gtk+ 2. PHP 5 has a brand new object model that solves all the lingering technical issues and allows for much more powerful control of the Gtk+ 2 interface. objects are no longer glorified arrays - they are always passed by reference since objects have destructors, memory is properly cleaned up no problems with method invocation (even something like %$button->get_child()->set_text()% is possible) PHP 5 also adds a number of features to aid OO programming: abstract classes, interface, private and protected methods and variables, exceptions, and much more.