php导出的excelfile一直在发出警告

Question

我试图创建一个将我的数据库的一部分导出为可读excel文件的功能。一切正常，但每次打开下载的文件时，我都会收到以下错误：

The file format and extension of [filename] don't match. The file could be corrupted or unsafe. Unless you trust its source, don't open it. Do you want to open it anyway?

代码：

//Get site location
    $siteLocation = Db::getInstance()->queryResults('SELECT place FROM site WHERE site_number=?', array($siteNumber));


// The function header by sending raw excel
header("Content-type: application/vnd-ms-excel");

$documentName = 'Content-Disposition: attachment; filename='. $siteNumber . ' ' . $siteLocation[0]->place .'.xls';

// Defines the name of the export file (siteNumber + site Location)
header($documentName);

// Add data table
include 'exceldata.php';

如何修复Excel对已编译的Excel文件的信任问题？

聚苯乙烯。点击“是”＆＃39;该文件打开正常，我不会收到与其他文件相同的消息。

提前致谢！

Answer 1

$documentName = 'Content-Disposition: attachment; filename='. $siteNumber .
' ' . $siteLocation[0]->place .'.xlsx'; // try other extension here

试试吗？希望它有效。