如何避免在PHP呼应的性格65279？ （这个问题也涉及到的Javascript xmlhttp.responseText（阿贾克斯）） [英] How to avoid echoing character 65279 in php? (This question also relates to Javascript xmlhttp.responseText (ajax))

问题描述

我也遇到了类似的问题描述这里（和其他地方） - 其中，作为一个Ajax回调，我收到了xmlhttp.responseText这似乎确定（当我提醒它 - 它显示了正确的文字） - 但是当使用一个'如果'语句来比较它的字符串 - 返回false

I have encountered a similar problem described here (and in other places) - where as on an ajax callback I get a xmlhttp.responseText that seems ok (when I alert it - it shows the right text) - but when using an 'if' statement to compare it to the string - it returns false.

（我也是谁写的服务器端code返回该字符串中的一个） - 经过多次研究串 - 我发现该字符串有一个隐形人物作为自己的第一个字符。这是没有显示的字符。如果我把它复制到记事本 - 然后被删除的第一个字符 - 它不会删除到pressing再次删除

(I am also the one who wrote the server-side code returning that string) - after much studying the string - I've discovered that the string had an "invisible character" as its first character. A character that was not shown. If I copied it to Notepad - then deleted the first character - it won't delete until pressing Delete again.

我做了一个字符$ C $猫（0）在xmlhttp.responseText返回的字符串。而它返回的 65279

I did a charCodeAt(0) for the returned string in xmlhttp.responseText. And it returned 65279.

谷歌搜索这表明，它是某种形式是应该设置大端或UTF-8的控制字符小尾数的编码。

Googling it reveals that it is some sort of a UTF-8 control character that is supposed to set "big-endian" or "small-endian" encoding.

所以，现在我知道了问题的原因 - 但是...为什么该字符被呼应？ 在源代码的PHP我只是使用

So, now I know the cause of the problem - but... why does that character is being echoed? In the source php I simply use

echo 'the string'...

和它显然在某种程度上输出[CHR（65279）串...

and it apparently somehow outputs [chr(65279)]the string...

为什么呢？我怎么能避免呢？

Why? And how can I avoid it?

推荐答案

要总结，并指定解决方案：

To conclude, and specify the solution:

Windows记事本添加BOM字符（3字节：EF BB BF），以保存使用UTF-8编码的文件

Windows Notepad adds the BOM character (the 3 bytes: EF BB BF) to files saved with utf-8 encoding.

PHP似乎并没有被它困扰 - 除非你包括一个PHP文件到另一个 - 然后，事情变得复杂和字符串被显示ppended他们的性格（65279）$ P $。

PHP doesn't seem to be bothered by it - unless you include one php file into another - then things get messy and strings gets displayed with character(65279) prepended to them.

您可以编辑与其他文本编辑器如记事本++的文件，并使用编码
恩code在UTF-8无BOM，
这似乎解决问题。

You can edit the file with another text editor such as Notepad++ and use the encoding
"Encode in UTF-8 without BOM",
and this seems to fix the problem.

此外，您还可以节省使用ANSI编码其它PHP文件在记事本中 - 这也似乎工作（即，如果你其实并不在该文件中使用任何扩展字符，我猜...）

Also, you can save the other php file with ANSI encoding in notepad - and this also seem to work (that is, in case you actually don't use any extended characters in the file, I guess...)

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