如何检测是否必须对字符串应用 UTF-8 解码或编码?
我有从第三方网站获取的提要，有时我必须应用 utf8_decode 和其他时候 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.
如果错误地应用相同的东西两次/或使用了错误的方法，我会得到更丑陋的东西，这就是我想要改变的.
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.
如何检测何时必须对字符串应用什么?
How can I detect when what have to apply on the string?
其实内容返回的是UTF-8，但里面有部分不是.
Actually the content returns UTF-8, but inside there are parts that are not.
推荐答案
我不能说我可以依赖 mb_detect_encoding().不久前我遇到了一些奇怪的误报.
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很好地工作的最普遍的方法是:
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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