What about Ctrl+Shift+M
to search through the functions names, or Ctrl+Shift+R
to search through the files names ?
Then, Ctrl+L
to go to the line you want.
Unfortunatly, I don't think you can do "goto file + goto line" using only one dialog :-(
For more things like these, open the "Navigate" menu ;-)
Edit : If you are looking for ways to do things faster, you might also be interested in the Eclipse PDT “tips” ? question I asked a while ago ;-) (there are not many answers, though :-( )
(warning: shameless marketing ahead)
The Open Resource (Ctrl+Shift+R) is a great solution indeed. If you are looking for something more powerful, we have an Eclipse plugin called nWire for PHP. It also provides quick-search, but you can search for everything: files, classes, variables, fields, methods, functions... everything.
Also, once you find the file you were looking for, you can select it and see all its' references in other files. You might find it useful.