html 文档中未声明的字符编码

2022-08-31 00:33:09

我有一个文件,我得到了一个非常奇怪的错误。错误是:

The character encoding of the HTML document was not declared. 
The document will render with garbled text in some browser configurations if 
the document contains characters from outside the US-ASCII range. 
The character encoding of the page must to be declared in the document or 
in the transfer protocol.

它来自的文件是(indexmws.php):

session_start();
if(!isset($_SESSION['validUser']) || $_SESSION['validUser'] !== true){
header('Location: loginmws.php');
}

include_once('db.php');
include_once('amazonmws.php');
include_once('decidemws.php');
include_once('author.php');
include_once('amazonPricingMWS.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" xml:lang="en" lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>Decision Maker</title>

这是一个文件的精确副本,不会引发错误(索引.php),除了添加amazonPricingMWS.php并重定向到标题中带有mws.php的页面:

session_start();
if(!isset($_SESSION['validUser']) || $_SESSION['validUser'] !== true){
header('Location: login.php');
}

include_once('db.php');
include_once('amazon.php');
include_once('decide.php');
include_once('author.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" xml:lang="en" lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>Decision Maker</title>

任何人都可以向我解释为什么我在indexmws中遇到此错误.php?


答案 1

出现此错误是因为浏览器期望编码格式在文件的前 1024 个字节中。在第一种情况下,可能包含的文件输出了一些内容。

浏览器现在缓冲文件的前 1024 个字节以检查字符编码。如果在前 1024 个字节中未遇到编码说明,则会显示此警告。

在您的例子中,您可以使用php头来指定内容类型,然后再包含其他文件:

header('Content-type: text/html; charset=utf-8');

有关详细信息,请阅读以下内容:http://gtmetrix.com/specify-a-character-set-early.html


答案 2

我有类似的问题,但这背后的确切原因是我错过了以下添加

<meta content="utf-8" http-equiv="encoding">

在头部标签之后

<meta content="text/html;charset=utf-8" http-equiv="Content-Type">

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