Check for file extension or mime type fails

Question

Found where I made the error, on the condition, my code was:

if ($filetype['type'] != $fileCSV || $filetype['type'] != $fileText) {
    echo "Error, the file $filename has not a valid extension: " . $filetype["ext"];
    continue;
}

And the right is this one:

if (!in_array($filetype['type'], array($fileCSV, $fileText))) {
    echo "Error, the file $filename has not a valid mimetype: " . $filetype["type"];
    continue;
}