通过 PHP 呈现纯文本
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Rendering plain text through PHP
提问by RabidFire
For some reason, I want to serve my robots.txt via a PHP script. I have setup apache so that the robots.txt file request (infact all file requests) come to a single PHP script.
出于某种原因，我想通过 PHP 脚本提供我的 robots.txt。我已经设置了 apache，以便 robots.txt 文件请求（实际上是所有文件请求）进入单个 PHP 脚本。
The code I am using to render robots.txt is:
我用来渲染 robots.txt 的代码是：
echo "User-agent: wget\n";
echo "Disallow: /\n";
However, it is not processing the newlines. How to server robots.txt correctly, so search engines (or any client) see it properly? Do I have to send some special headers for txt files?
但是，它不处理换行符。如何正确服务器 robots.txt，以便搜索引擎（或任何客户端）正确查看它？我是否必须为 txt 文件发送一些特殊的标题？
EDIT 1:
编辑 1：
Now I have the following code:
现在我有以下代码：
header("Content-Type: text/plain");
echo "User-agent: wget\n";
echo "Disallow: /\n";
which still does not display newlines (see http://sarcastic-quotes.com/robots.txt).
它仍然不显示换行符（参见http://sarcastic-quotes.com/robots.txt）。
EDIT 2:
编辑2：
Some people mentioned its just fine and not displayed in browser. Was just curious how does this one display correctly: http://en.wikipedia.org/robots.txt
有些人提到它很好，没有显示在浏览器中。只是好奇这个如何正确显示：http: //en.wikipedia.org/robots.txt
EDIT 3:
编辑 3：
I downloaded both mine and wikipedia's through wget, and see this:
我通过 wget 下载了我的和维基百科的，并看到了这个：
$ file en.wikipedia.org/robots.txt
en.wikipedia.org/robots.txt: UTF-8 Unicode English text
$ file sarcastic-quotes.com/robots.txt
sarcastic-quotes.com/robots.txt: ASCII text
FINAL SUMMARY:
最终总结：
Main issue was I was not setting the header. However, there is another internal bug, which is making the Content-Type as html. (this is because my request is actually served through an internal proxy but thats another issue).
主要问题是我没有设置标题。但是，还有另一个内部错误，就是将 Content-Type 设为 html。（这是因为我的请求实际上是通过内部代理提供的，但那是另一个问题）。
Some comments that browsers don't display newline were only half-correct-> modern browsers correctly display newline if content-type is text/plain. I am selecting the answer that closely matched the real problem and was void of the above slightly misleading misconception :). Thanks everyone for the help and your time!
一些关于浏览器不显示换行符的评论只对了一半-> 如果内容类型是文本/纯文本，现代浏览器会正确显示换行符。我正在选择与实际问题密切匹配的答案，并且没有上述略有误导性的误解:)。感谢大家的帮助和您的时间！
thanks
谢谢
JP
J.P
回答by RabidFire
Yes, you forgot to set the Content Type of your output to text/plain:
是的，您忘记将输出的内容类型设置为text/plain：
header("Content-Type: text/plain");
Your output is probably being sent as HTML, where a newline is truncated into a space, and to actually display a newline, you would need the <br />tag.
您的输出可能作为 HTML 发送，其中换行符被截断为空格，并且要实际显示换行符，您需要<br />标签。
回答by Neil E. Pearson
header('Content-Type: text/plain')is correct.- You must call this method beforeanything is written to your output, including white space. Check for whitespace before your opening
<?php. - If your
Content-Typeheader has been set totext/plain, no browser in its right mind would collapse whitespace. That behaviour is exclusive to HTML and similar formats. - I'm sure you have your reasons, but as a rule, serving static content through PHP uses unnecessary server resources. Every hit to PHP is typically a new process spawn and a few megs of memory. You can use apache config directives to point to different robots files based on headers like
User-Agent- I'd be looking into that. - It's likely that search engines ignore the
Content-Typeheader, so this shouldn't be an issue anyway.
header('Content-Type: text/plain')是正确的。- 您必须在将任何内容写入输出之前调用此方法，包括空格。在您打开之前检查空格
<?php。 - 如果您的
Content-Type标头已设置为text/plain，那么头脑正常的浏览器不会折叠空白。这种行为是 HTML 和类似格式独有的。 - 我相信您有自己的理由，但通常情况下，通过 PHP 提供静态内容会使用不必要的服务器资源。对 PHP 的每次攻击通常都会产生一个新进程和几兆内存。您可以使用 apache 配置指令根据标头指向不同的机器人文件，例如
User-Agent- 我会研究一下。 - 搜索引擎很可能会忽略
Content-Type标题，因此无论如何这都不是问题。
Hope this helps.
希望这可以帮助。
-n
-n
回答by deceze
<?php header("Content-Type: text/plain"); ?>
User-agent: wget
Disallow: /
BTW, the newlines are there just fine. They're just not displayed in a browser. Browsers collapse all whitespace, including newlines, to a single space.
顺便说一句，换行符在那里就好了。它们只是没有显示在浏览器中。浏览器将所有空格（包括换行符）折叠为一个空格。
deceze$ curl http://sarcastic-quotes.com/robots.txt
User-agent: wget
Disallow: /
回答by Matthew Scharley
You must set the content type of the document you are serving. In the case of a .txt text file:
您必须设置您所服务的文档的内容类型。对于 .txt 文本文件：
header("Content-Type: text/plain");
The IANA has information about some of the more popular MIME (content) types.
IANA 有关于一些更流行的 MIME（内容）类型的信息。
回答by anakin
i was having a similar issue and either "\n" nor PHP_EOL worked. I finally used:
我遇到了类似的问题，无论是“\n”还是 PHP_EOL 都有效。我终于使用了：
header('Content-Disposition: attachment; filename="plaintext.txt"');
header("Content-Type: text/plain");
echo "some data";
echo chr(13).chr(10);
The echo of BOTH characters did the trick. Hope it helps someone.
两个角色的回声都起到了作用。希望它可以帮助某人。
Bye anankin
再见阿南金
回答by Thomas Havlik
If you are using echo, then use <br>for new lines. the printf function is what uses \n.
如果您使用的是回声，则用于<br>换行。printf 函数就是使用\n 的。
In your case, use printf because you are not using HTML. I believe this is the proper way to do this, along with setting the MIME type to text.
在您的情况下，请使用 printf 因为您没有使用 HTML。我相信这是正确的方法，同时将 MIME 类型设置为文本。
