我想用多张纸生成 xls 文件。所以，我从下面提到的链接中获得了帮助。
http://pear.php.net/package/Spreadsheet_Excel_Writer
使用同一个教程文档，我能够在我的 xls 文件中创建多张工作表。即，在我的 test.xls 文件中，我能够创建 sheet1、sheet2、sheet2 等。
现在，我想在 sheet1 的内容中添加一个链接，以便 sheet2 显示数据。我正在通过 Worksheet::writeUrl 方法。但是，我没有在内容中添加链接。
示例代码如下：
require_once 'Spreadsheet/Excel/Writer.php';
$workbook = new Spreadsheet_Excel_Writer();
$workbook->send('test.xls');
$worksheet =& $workbook->addWorksheet('Report');
$worksheet1 =& $workbook->addWorksheet('John Smith');
$sheet = "John Smith";
$worksheet->write(0, 0, 'Name');
$worksheet->write(0, 1, 'Age');
$format =& $worksheet->writeUrl(1,0 ,"internal:".$sheet."!A1", $sheet);
$worksheet->write(1, 1, 30);
$worksheet->write(2, 0, 'Johann Schmidt');
$worksheet->write(2, 1, 31);
$worksheet->write(3, 0, 'Juan Herrera');
$worksheet->write(3, 1, 32);
$worksheet1->write(0, 0, 'Name');
$worksheet1->write(0, 1, 'Age');
$worksheet1->write(1, 0, 'aaaaaa');
$worksheet1->write(1, 1, 30);
$worksheet1->write(2, 0, 'bbbbb');
$worksheet1->write(2, 1, 31);
$worksheet1->write(3, 0, 'ccccc');
$worksheet1->write(3, 1, 32);
$workbook->close();
请帮我添加链接。