If for some reason you decide to swap from one Eclipse based PHP IDE to another, rather than recreate the projects you can change their association, so that the project builders work correctly.
This is basically what you need to do if you get the following error when trying to ctrl clicka function:
“The resource is not on the build path of a PHP project”
To convert to a PHPEclipse compatible project you basically need to replace the buildSpec and natures sections of the* .project* file with the following:
If you need to convert the other way, or to something else, simply grab the appropriate section from a working project and paste it into the* .project* file you need to fix.