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phpdesktop chrome-不适用于php中的标头

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phpdesktop chrome-不适用于php中的标头,php,phpdesktop,Php,Phpdesktop,我有一个PHP文件，每当在PHPphpdesktop chrome（APP）中运行一个文件时，我就会看到下面的内容，我的文件中只有以下代码 header("Content-Type: application/xls"); header("Content-Disposition: attachment; filename=filename.xls"); header("Pragma: no-cache"); header("Expires: 0"); 下面是我的错误代码 Warning: Can

我有一个PHP文件，每当在PHPphpdesktop chrome（APP）中运行一个文件时，我就会看到下面的内容，我的文件中只有以下代码

header("Content-Type: application/xls");
header("Content-Disposition: attachment; filename=filename.xls");
header("Pragma: no-cache");
header("Expires: 0");
下面是我的错误代码

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\abc\www\backend\check.php:2)
Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\abc\www\backend\check.php:3)
Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\abc\www\backend\check.php:4)
Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\abc\www\backend\check.php:5)
尝试插入
ob_start（）在第一次
之后，查看这篇文章，得到相同的警告。