php RSS 提要中的 utf-8 和 htmlentities
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utf-8 and htmlentities in RSS feeds
提问by Doug Kaye
I'm writing some RSS feeds in PHP and stuggling with character-encoding issues. Should I utf8_encode() before or after htmlentities() encoding? For example, I've got both ampersands and Chinese characters in a description element, and I'm not sure which of these is proper:
我正在用 PHP 编写一些 RSS 提要，并且正在处理字符编码问题。我应该在 htmlentities() 编码之前还是之后使用 utf8_encode()？例如，我在 description 元素中有 & 号和中文字符，但我不确定其中哪一个是正确的：
$output = utf8_encode(htmlentities($source)); or
$output = htmlentities(utf8_encode($source));
And why?
为什么？
回答by Eran Galperin
It's important to pass the character set to the htmlentities function, as the default is ISO-8859-1:
将字符集传递给 htmlentities 函数很重要，因为默认值为 ISO-8859-1：
utf8_encode(htmlentities($source,ENT_COMPAT,'utf-8'));
You should apply htmlentities first as to allow utf8_encode to encode the entities properly.
您应该首先应用 htmlentities 以允许 utf8_encode 正确编码实体。
(EDIT: I changed from my opinion before that the order didn't matter based on the comments. This code is tested and works well).
（编辑：我之前改变了我的观点，根据评论顺序无关紧要。此代码经过测试并且运行良好）。
回答by Gumbo
First: The utf8_encodefunctionconverts from ISO 8859-1 to UTF-8. So you only need this function, if your input encoding/charset is ISO 8859-1. But why don't you use UTF-8 in the first place?
第一：utf8_encode函数从 ISO 8859-1 转换为 UTF-8。所以你只需要这个函数，如果你的输入编码/字符集是 ISO 8859-1。但是你为什么不首先使用 UTF-8 呢？
Second: You don't need htmlentities. You just need htmlspecialcharsto replace the special characters by character references. htmlentitieswould replace “too much” characters that can be encoded directly using UTF-8. Important is that you use the ENT_QUOTESquote style to replace the single quotes as well.
第二：你不需要htmlentities. 您只需要用htmlspecialchars字符引用替换特殊字符。htmlentities将替换可以使用 UTF-8 直接编码的“太多”字符。重要的是您也使用ENT_QUOTES引号样式来替换单引号。
So my proposal:
所以我的建议是：
// if your input encoding is ISO 8859-1
htmlspecialchars(utf8_encode($string), ENT_QUOTES)
// if your input encoding is UTF-8
htmlspecialchars($string, ENT_QUOTES, 'UTF-8')
回答by Kornel
Don't use htmlentities()!
不要用htmlentities()！
Simply use UTF-8 characters. Just make sure you declare encoding of the feed in HTTP headers (Content-Type:application/xml;charset=UTF-8) or failing that, in the feed itself using <?xml version="1.0" encoding="UTF-8"?>on the first line.
只需使用 UTF-8 字符。只需确保您在 HTTP 标头 ( Content-Type:application/xml;charset=UTF-8) 中声明提要的编码，否则在提要本身中使用<?xml version="1.0" encoding="UTF-8"?>第一行。
回答by Kornel
It might be easier to forget htmlentities and use a CDATA section. It works for the title section, which doesn't seem support encoded HTML characters in Firefox's RSS viewer:
忘记 htmlentities 并使用 CDATA 部分可能更容易。它适用于标题部分，它似乎不支持 Firefox 的 RSS 查看器中的编码 HTML 字符：
<title><![CDATA[News & Updates " > ? ? ? ? ? Test!]]></title>
回答by SoapBox
You want to do $output = htmlentities(utf8_encode($source));. This is because you want to convert your international characters into proper UTF8 first, and then have ampersands (and possibly some of the UTF-8 characters as well) turned in to HTML entities. If you do the entities first, then some of the international characters may not be handled properly.
你想做什么$output = htmlentities(utf8_encode($source));。这是因为您想先将国际字符转换为正确的 UTF8，然后将与号（可能还有一些 UTF-8 字符）转换为 HTML 实体。如果先做实体，那么有些国际字可能处理不好。
If none of your international characters are going to be changed by utf8_encode, then it doesn't matter which order you call them in.
如果您的任何国际字符都不会被 utf8_encode 更改，那么您调用它们的顺序无关紧要。
回答by katy lavallee
After much trial & error, I finally found a way to properly display a string from a utf8-encoded database value, through an xml file, to an html page:
经过多次反复试验，我终于找到了一种方法，可以将 utf8 编码的数据库值中的字符串通过 xml 文件正确显示到 html 页面：
$output = '<![CDATA['.utf8_encode(htmlentities($string)).']]>';
I hope this helps someone.
我希望这可以帮助别人。
