[PHP] Determining file types of uploaded files

[Ezra Freedman]

Is there a way to determine the file type of a file uploaded via an <INPUT
TYPE="file"> form?
I know that getimagesize() tells you if a file is a GIF, JPG or PNG -- I'm
interested in determining if a file is a valid PDF or valid Word document.

Thanks for the help.
Ezra 

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