PHP读取Excel图片对象，并保存替换为相对路径

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php利用phpspreadsheet 和 xlswriter 读取excel图片对象，保存替换为相对路径

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spreadsheet = $reader->load($excel_file);

        $config = ['path' => dirname($excel_file)];
        $this->xls_writer = new Excel($config);

        $this->image_path = dirname($excel_file) . $this->relative_path;
        if (!is_dir($this->image_path)) {
            mkdir($this->image_path, 0755);
        }
    }

    /**
     * @throws Exception
     */
    public function handle()
    {
        $write_filename = date('YmdHis') . '.xlsx';
        $sheetCount = $this->spreadsheet->getSheetCount();
        for ($i = 0; $i < $sheetCount; $i++) {
            $worksheet = $this->spreadsheet->getSheet($i);
            $data = $worksheet->toArray();
            $sheetNames = $this->spreadsheet->getSheetNames();
            var_dump($sheetCount, $sheetNames);
            // 读取并修改
            foreach ($worksheet->getDrawingCollection() as $drawing) {
                /**@var $drawing Drawing* */
                list($startColumn, $startRow) = Coordinate::coordinateFromString($drawing->getCoordinates());
                $image_filename = "/{$i}-" . $drawing->getCoordinates();
                $image_suffix = $this->saveImage($drawing, $image_filename);
                $image_name = ltrim($this->relative_path, '/') . "{$image_filename}.{$image_suffix}";
                var_dump($image_name);
                $startColumn = $this->ABC2decimal($startColumn);

                $data[$startRow - 1][$startColumn] = $image_name;
            }

            // 写入文件
            if ($i == 0) {
                $this->sheet_writer = $this->xls_writer->fileName($write_filename, $sheetNames[$i])->data($data);
            } else {
                // 向文件中追加工作表
                $this->sheet_writer->addSheet($sheetNames[$i])->data($data);
            }
        }
        // 最后的最后，输出文件
        $filePath = $this->sheet_writer->output();
        var_dump($filePath);
    }

    /**
     * 保存图片
     *
     * @param Drawing $drawing
     * @param $image_filename
     * @return string
     * @throws Exception
     */
    protected function saveImage(Drawing $drawing, $image_filename)
    {
        $image_filename .= '.' . $drawing->getExtension();
        switch ($drawing->getExtension()) {
            case 'jpg':
            case 'jpeg':
                $source = imagecreatefromjpeg($drawing->getPath());
                imagejpeg($source, $this->image_path . $image_filename);
                break;
            case 'gif':
                $source = imagecreatefromgif($drawing->getPath());
                imagegif($source, $this->image_path . $image_filename);
                break;
            case 'png':
                $source = imagecreatefrompng($drawing->getPath());
                imagepng($source, $this->image_path . $image_filename);
                break;
            default:
                throw new Exception('image format error!');
        }

        return $drawing->getExtension();
    }

    /**
     * 坐标转换
     *
     * @param $abc
     * @return float|int
     */
    protected function ABC2decimal($abc)
    {
        $ten = 0;
        $len = strlen($abc);
        for ($i = 1; $i <= $len; $i++) {
            $char = substr($abc, 0 - $i, 1);//反向获取单个字符

            $int = ord($char);
            $ten += ($int - 65) * pow(26, $i - 1);
        }
        return $ten;
    }
}