如何检测是否必须在字符串上应用utf8解码或编码？ [英] How to detect if have to apply utf8 decode or encode on a string?

问题描述

我有一个从第三方网站采集的Feed，有时我必须申请 utf8_decode 等等。 utf8_encode 获得所需的可见输出。

如果错误地将相同的内容应用了两次，或者使用错误的方法，我会得到一些更丑陋的东西，这就是我想要的

如何检测何时应用于字符串？

更新

实际上，内容返回UTF-8，但内部有部分不是。

解决方案

我不能说我可以依靠 mb_detect_encoding（）。有一些怪异的假阳性一段时间。

我发现在每一种情况下工作得最好的最普遍的方式是：

如果（preg_match（'!! u'，$ string））
{
//这是utf-8
}
else
{
//绝对不是utf-8
}

I have a feed taken from 3rd party sites, and sometimes I have to apply utf8_decode and other times utf8_encode to get the desired visible output.

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.

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

UPDATE

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

解决方案

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

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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