Grafika\Imagick\Editor::_getImageTypeFromFileName PHP Method

    private function _getImageTypeFromFileName($imageFile)
    {
        $ext = strtolower((string) pathinfo($imageFile, PATHINFO_EXTENSION));
        if ('jpg' == $ext or 'jpeg' == $ext) {
            return ImageType::JPEG;
        } else {
            if ('gif' == $ext) {
                return ImageType::GIF;
            } else {
                if ('png' == $ext) {
                    return ImageType::PNG;
                } else {
                    return ImageType::UNKNOWN;
                }
            }
        }
    }