You could look at file signatures: https://en.wikipedia.org/wiki/List_of_file_signatures
Of course that doesn't guaruntee that the file is valid/conforms to the format.
On 10/31/2013 02:32 PM, Claudio Dusan Vega Ozuljevich wrote:
Hi guys! Sorry for the noob question, but I just learned programming and I'm still struggling to get the hang of it. I need to know if there is a way to check the file type (pdf, doc, jpeg etc) of an uploaded file, so I can store it just if it complies with my requirements. Fo example, I want to check if a file is an image (jpeg), an in case it is store it and in case it isn't just show an error message. I'm not referring the issue as "the extension" of the file, because the extension can be change and file would still be a .exe but just with the ".jpeg" extension. Thanks beforehand.
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