How to check if a file is an archive before uploading it to a server?-CodePudding

I need to check if a file that's about to be uploaded via input field is really an archive. For images I can just do $my_image['type'] to get the type, but if I do the same for a .rar file the returned type is 'application/octet-stream'. I've tried to open the file to check if it's an archive, only to find out later that apparently that can't be done to a file before it's uploaded.

Where do I go from here?

CodePudding user response：

Try to use pathinfo() function to get the file extension then check if it is an extension that corresponds to an archive file format that you want to support

$fileInfo = pathinfo($_FILES["my_file"]["name"]);
$fileExt  = $fileInfo["extension"];

if($fileExt == "zip" || $fileExt == "rar" || $fileExt == "tar" || $fileExt == "gz")
    // your file is an archive
else
    // your file is not an archive

You can also try another solution by using mime_content_type to get the MIME type of your uploaded file and check if it corresponds to an archive file format