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I read that for images, it’s not safe to depend on the file extension and that it’s better to try to open the php with an image library like gd to verify its extension.
What about other types of files? If I have a .doc or .pdf or any other file type, how can I really tell the file type is really what it claims it is?
If you are on a *nix system the
filecommand does a pretty good job at guessing mime type. It is not perfect, and fails on ‘nested’ types like.tar.gzbut it is pretty good.As i understand it Fileinfo uses the same magic numbers approach as
filewithout needing to go to the shell…