Method getMimeType

public static function getMimeType($filename)
{
    $ext = File::getExt($filename);
    switch (strtolower($ext)) {
        case 'png':
            $mime = 'image/png';
            break;
        case 'jpg':
        case 'jpeg':
            $mime = 'image/jpeg';
            break;
        case 'gif':
            $mime = 'image/gif';
            break;
        case 'webp':
            $mime = 'image/webp';
            break;
        default:
            $mime = '';
            break;
    }
    return $mime;
}