A while back, I wrote an article on developing desktop applications in PHP, using PHP-GTK to demonstrate. At the time, I was using a beta build of the PHP-GTK extension. A few days ago, PHP-GTK 2 stable “leap day special” was released, and it’s now better than ever.
Check out the changelog; notable changes since v1 include greatly improved API coverage, support for GTK versions up to 2.12, clipboard support and some restructuring. Head over to the PHP-GTK download page and grab a copy from CVS; if you’re running Windows, try Gnope, a simple PHP-GTK installer for Windows.