ArgoUML, the Open Source modelling tool from Tigris now has PHP support. Still experimental but good news for anyone hunting for a PHP modelling tool.
You can get the files from http://argouml.tigris.org/servlets/ProjectDocumentList.
With a few minutes playing managed to get it up and running with the Java 2 1.4.2 SDK (docs say it should work with 1.3+).
- Downloaded / extracted ArgoUML-0.14.tar.gz - Downloaded / extracted ArgoUML-0.14-modules.tar.gz (PHP support here) - extract below the main Argo dir - Run java -jar argouml.jar from the main Argo dir
Currently seems to have support for generating PHP code from UML (but not vice versa).
Not happy? Try Umbrello instead (if you can: Linux / KDE).