无法在PHP中修改标题信息警告消息？ [英] Cannot modify header information Warning message in PHP?
问题描述
我的 index.php 页码是 -
<?php
if(!$_COOKIE['authorized'] == 1) {
header("Location: login.php");
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org /TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>My Photo Website</title>
<script src="js/jquery-1.2.6.pack.js" type="text/javascript"></script>
<script src="js/jquery.lightbox-0.5.pack.js" type="text/javascript"></script>
<script src="js/myscript.js" type="text/javascript"></script>
<link rel="stylesheet" href="css/default.css" />
<link rel="stylesheet" href="css/jquery.lightbox-0.5.css" />
</head>
<body>
<form method="post" action="changePhotoTitle.php">
<div id="container">
<h1>My Photos <small>click on the text to change the title.</small></h1>
<a href="login.php?logout=1" id="logout">logout</a>
<div id="main">
<?php require 'getPhotos.php'; ?>
<div id="response" class="hidden" />
</div><!-- end main-->
</div><!-- end container-->
</form>
</body>
</html>
我的database.php页面代码是 -
<?php
$db_name = "db";
$db_server = "localhost";
$db_user = "root";
$db_pass = "";
$mysqli = new MySQLi($db_server, $db_user, $db_pass, $db_name) or die(mysqli_error());
?>
但随后出现警告信息 -
警告：无法修改标题信息 - 已在第4行的C：\ xampp \ htdocs \ pics \ index.php中发送的输出（输出从C：\ xampp \ htdocs \ pics \ index.php：1开始）
but followong warning message is coming- Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\pics\index.php:1) in C:\xampp\htdocs\pics\index.php on line 4
推荐答案
从维基百科条目中引用BOM：
Quoting from the Wikipedia entry for BOM:
字节顺序标记
许多Windows程序（包括
Windows记事本）添加字节0xEF，$ b保存为UTF-8的任何
文档开头的$ b 0xBB，0xBF。这是Unicode字节
订单标记（BOM）的
UTF-8编码，通常是
，称为UTF-8 BOM，即使
不相关到字节顺序。如果带有BOM的另一个
编码转换为
UTF-8而不剥离它，也会出现
BOM。
Many Windows programs (including Windows Notepad) add the bytes 0xEF, 0xBB, 0xBF at the start of any document saved as UTF-8. This is the UTF-8 encoding of the Unicode byte order mark (BOM), and is commonly referred to as a UTF-8 BOM even though it is not relevant to byte order. The BOM can also appear if another encoding with a BOM is translated to UTF-8 without stripping it.
存在UTF-8 BOM可能会导致
现有软件的互操作性问题，否则可以处理UTF-8，例如：
The presence of the UTF-8 BOM may cause interoperability problems with existing software that could otherwise handle UTF-8, for example:
+ 较旧的文本编辑器可能会在文档的开头显示BOM作为，即使UTF-8文件仅包含ASCII，否则将正确显示。
+ 编程语言解析器通常可以在字符串常量和注释中处理UTF-8，但无法解析文件开头的BOM。
+ Older text editors may display the BOM as "" at the start of the document, even if the UTF-8 file contains only ASCII and would otherwise display correctly.
+ Programming language parsers can often handle UTF-8 in string constants and comments, but cannot parse the BOM at the start of the file.
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