phpdesktop-chrome - 不适用于 php 中的标头

Question

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)

Answer 1

尝试在第一个<?php 开始标记之后插入ob_start();。