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Alex Rivera
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I’m working on an upload form in PHP that must allow only MP3 files. When the upload is done, I analyze the file to check whether is it really an MP3. The first step is to detect the mime type as audio/mpeg . I use the libraries finfo_file() and works fine except that during the tests some MP3 files are rejected because their MIME type results as application/octet-stream . My questions are: Should my app definitely refuse those MP3 files? They actually play audio. Is there any reason why this MIME type is an MP3? is the detection of MIME type the most sure way to know the kind of file?
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