Since the bump to 3.1.1 recently, the ebuild documentation no longer corresponds to correct location of the setup script. Also the new setup script uses filter_input() frequently and hence the filter USE flag is now a dependancy of this package should someone wish to use the packaged setup script to install.
Created attachment 178309 [details] tmp/postinstall-en-3.1.1.txt New location of setup script
Created attachment 178311 [details] tmp/phpmyadmin-3.1.1.ebuild.path New doc and dependancy
*** Bug 255846 has been marked as a duplicate of this bug. ***
Thank you Jamie. Fixed in phpmyadmin-3.1.2.