PHP - 无法修改标头信息 - 标头已由（输出开始于
[英]PHP - cannot modify header information - headers already sent by (output started at
问题描述
I am working with PHP and I got this message
我正在使用 PHP，我收到了这条消息
cannot modify header information - headers already sent by (output started at
after executing a code which looks like this:执行如下代码后：
<?php
if (condition) {
if (condition) {
//Statement
}
$to = $_POST['email'];
$subject = "Registration Confirmation";
$message = '
<html>
<head>
<title>'.$subject.'</title>
</head>
</html>
';
// Always set content-type when sending HTML email
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
// More headers
$headers .= 'From: <contact@ghanalifestore.com>' . "\r\n";
mail($to,$subject,$message,$headers);
header('Location: reset.php?username='.$username);
exit();
}else {
//statement
}
Based on this answer from Stackoverflow , I think the error is coming from the HTML code in the variable $message .根据Stackoverflow的这个答案，我认为错误来自变量$message中的 HTML 代码。 I don't really know how I can modify the content of that variable to avoid the error.我真的不知道如何修改该变量的内容以避免错误。
Kindly help me solve this problem.请帮我解决这个问题。
5 个解决方案
解决方案1
8 2016-06-25 11:39:37
ob_start(); ob_start();
html is also sending output that is why this is happening so use ob_start(); html 也在发送输出，这就是发生这种情况的原因，所以使用 ob_start(); in top of your code, hope this solves your problem.在您的代码之上，希望这可以解决您的问题。
解决方案2
6 已采纳 2016-06-25 11:42:42
From php documentation :来自php 文档：
Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.
So move header('Location: reset.php?username='.$username);所以移动header('Location: reset.php?username='.$username); before any other kind of output.在任何其他类型的输出之前。
By the way, this question was already answered:顺便说一句，这个问题已经回答了：
解决方案3
0 2019-01-22 04:08:37
just change your code to echo'window.location="dashboard.php?id=40";';只需将代码更改为 echo'window.location="dashboard.php?id=40";'; then it will work然后它会工作
解决方案4
0 2019-01-22 04:40:06
change your code:-更改您的代码：-
echo'window.location="username='.$username";'; echo'window.location="username='.$username";';
exit();出口（）;
解决方案5
0 2019-11-23 16:45:15
Only writing the following code, solved my problem. 只写下面的代码，解决了我的问题。 This problem appeared in cpanel hosting and not in other hosting 此问题出现在cpanel托管中，而不是在其他托管中
解决方案6
0 2021-10-29 18:28:40
I pulled my hair out trying to find this issue in PHP code only to find that clearing the cache (Firefox) removed the error.我试图在 PHP 代码中找到这个问题，却发现清除缓存（Firefox）消除了错误。 If you are changing code, copying files, etc. your browser could get very confused so whenever you have an error like this or any error that involves how the code is read and you are observing irregularities on the screen or confusing log errors be sure to clear the cache and restart your browser as a possible remedy.如果您正在更改代码、复制文件等，您的浏览器可能会变得非常混乱，因此每当您遇到此类错误或任何涉及代码读取方式的错误并且您观察到屏幕上的不规则或令人困惑的日志错误时，请务必清除缓存并重新启动浏览器作为可能的补救措施。
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