FastImage::getType PHP Method

    public function getType()
    {
        if (!$this->handle) {
            return false;
        }
        $this->strpos = 0;
        if (!$this->type) {
            switch ($this->getChars(2)) {
                case "BM":
                    return $this->type = 'bmp';
                case "GI":
                    return $this->type = 'gif';
                case chr(0xff) . chr(0xd8):
                    return $this->type = 'jpeg';
                case chr(0x89) . 'P':
                    return $this->type = 'png';
                default:
                    return false;
            }
        }
        return $this->type;
    }