FastImage::parseSizeForBMP PHP Method

    private function parseSizeForBMP()
    {
        $chars = $this->getChars(29);
        $chars = substr($chars, 14, 14);
        $type = unpack('C', $chars);
        return reset($type) == 40 ? unpack('L*', substr($chars, 4)) : unpack('L*', substr($chars, 4, 8));
    }