如何检测是否必须对字符串应用UTF-8解码或编码? [英] How do I detect if have to apply UTF-8 decode or encode on a string?

问题描述

我从第三方站点获取了一个供稿，有时我必须应用utf8_decode，有时需要应用utf8_encode，以获得所需的可见输出.

I have a feed taken from third-party sites, and sometimes I have to apply utf8_decode and other times utf8_encode to get the desired visible output.

如果错误地将相同的东西应用了两次/或者使用了错误的方法，我会变得更加难看，这就是我要更改的地方.

If by mistake the same stuff is applied twice/or the wrong method is used I get something more ugly, this is what I want to change.

如何检测什么时候需要在字符串上应用什么内容?

How can I detect when what have to apply on the string?

实际上，内容返回的是UTF-8，但是里面有一些不是的部分.

Actually the content returns UTF-8, but inside there are parts that are not.

推荐答案

我不能说我可以依靠mb_detect_encoding().我前段时间有一些怪异的误报.

I can't say I can rely on mb_detect_encoding(). I had some freaky false positives a while back.

我发现在每种情况下都能正常工作的最普遍的方式是:

The most universal way I found to work well in every case was:

if (preg_match('!!u', $string))
{
   // This is UTF-8
}
else
{
   // Definitely not UTF-8
}

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