... just this one feature that I've been nagging to have =/ I haven't been able to search for it because I don't know what it's called. I currently use Aptana Studio and it is pretty good but it doesn't have what I want (or maybe it does and I don't know how to get it working.) You know, with Visual Studio, you use the #include pre-processor directive and IntelliSense automatically reads the file specified and provides code completion for it (along with other things), right? Is there a PHP IDE that provides the same thing for include() and include_once()? I find it a chore to have to continuously change tabs just to read the code, then lose my train of thought on occasion. Aptana Studio has code completion, but only if the function/class is in the file you are editing, you can't "include" another file and have it provide code completion for functions/classes in that other file. (Or, I haven't figured out how to enable it..) Right now, everything else is pretty much secondary; I just want this one little feature.