File Type?

[The Hobo]

I can't figure out what's wrong with this:

if ($userfile_type != "image/gif" || $usefile_type != "image/jpeg") {
        echo "Invalid file type!";
} else {
        echo "It's good!";
} 

When the conditional should be false, it goes to true anyways.

However, this will work:

if ($userfile_type != "image/gif") {
        echo "Invalid file type!";
} else {
        echo "It's good!";
}