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我有一个 PHP 文件，每当在 PHP phpdesktop-chrome (APP)中运行一个文件时，我都在下面，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");

以下是我的错误代码。

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)
4

1 回答 1

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尝试ob_start();在第一个<?php开始标签之后插入。

于 2019-08-09T10:52:50.743 回答