为什么得到文件错误：“数据可能已经丢失”，当打开excel文件在xls格式与微软excel 2007版本？

我正在努力生成excel file.it是succssfully生成文件，但当我试图打开它显示error.pleasebuild议我如何解决它。

这是我的代码

require_once "../php_writeexcel-0.3.0/class.writeexcel_workbook.inc.php"; require_once "../php_writeexcel-0.3.0/class.writeexcel_worksheet.inc.php"; $fname = tempnam("/tmp", "demo.xls"); $workbook =& new writeexcel_workbook($fname); $worksheet =& $workbook->addworksheet('Demo'); $worksheet2 =& $workbook->addworksheet('Another sheet'); $worksheet3 =& $workbook->addworksheet('And another'); $worksheet->set_column('A:C', 32); $heading =& $workbook->addformat(array( bold => 1, color => 'blue', size => 18, merge => 1, )); $headings = array('Out Telco Wise Report', ''); $worksheet->write_row('C1', $headings, $heading); $worksheet->write('A2', "Request From"); $worksheet->write('B2', "Out Telco"); $worksheet->write('C2', "Total"); $i=3; while($rowres=mysql_fetch_array($result_excel)) { $sql3="select ceil(length(msg_body)/160) as no_sms, count(*)as total from outbox ".$with_out_client." AND request_from='".$rowres['request_from']."' AND out_telco='". $rowres['out_telco']."' group by no_sms"; $result2=mysql_query($sql3); $count2=0; while($row2 = mysql_fetch_array($result2)) { $count2 =$count2+($row2['total']*$row2['no_sms']); } $worksheet->write('A'.$i, $rowres["request_from"]); $worksheet->write('B'.$i, $rowres["out_telco"]); $worksheet->write('C'.$i, $count2); $i++; } $workbook->close(); header("Content-Type:application/vnd.ms-excel; name=\"example-demo.xls\""); header("Content-Disposition: attachment; filename=\"example-demo.xls\""); $fh=fopen($fname, "rb"); fpassthru($fh); unlink($fname);