This page has a list of “magic” file signatures. Grab the ones you need and put them in a dict like below. Then we need a function that matches the dict keys with the start of the file. I’ve written a suggestion, though it can be optimized by preprocessing the magic_dict into e.g. one giant … Read more
The answers from freedompeace, Kiyarash and Sam Vloeberghs: .rar application/vnd.rar, application/x-rar-compressed, application/octet-stream .zip application/zip, application/octet-stream, application/x-zip-compressed, multipart/x-zip I would do a check on the file name too. Here is how you could check if the file is a RAR or ZIP file. I tested it by creating a quick command line application. <?php if (isRarOrZip($argv[1])) … Read more