The answer is simply no.
Word files in doc format are binary files, not plain text. You'll need something that can actually break down the file format, because you can't simply fread() or fets() through it. Anyway, PHP does NOT sound like the right tool for the job. I'd expect that to be a Python or C or C++ application. You could just used OpenOffice.org.
If you need to do this to a large number of documents, don't waste your time, go get Office 2003 and just export to HTML (simple) (or whatever it's called...something like that). The newer versions of Office don't make such a mess of the markup. Plus, you can save in XML (WordML) and then just write a nice WordML parser, which you COULD write in PHP.
If you're serious, and not just doing this for fun or for something pointless, you need to read up on Microsoft's file formats. If you can pull this off, you'd have a viable commercial application on your hands.