Code Assist Eclipse

I'm using Europa Eclipse (3.3).And one day, i don't know why php assist in Eclipse cannot be used in new Php Project.But in the old one, it works.
So i copy a file naming .project from my old project,edit it a little and copy to my new project.
Now, code assist works in new project.
Moreover, i can't not remove subversion out of my projects by using GUI in Eclipse.
Subversion is stored as .svn in each directory of your project.
Delete .svn and the project will be out of SVN.