如果（0 =='％'）echo“WTF，Php，为什么你不能理智地比较事情？ [英] if(0 == '%') echo "WTF, Php, why can't you compare things sanely?"

问题描述

我只是把一个疯狂的bug修改为这个问题的标题。
我相信有一个完全合理的解释为什么Php认为0 =='％'（或任何其他特殊字符，我想）。
我认为对StackOverflow有好的解释。

I just reduced a crazy bug to what's in the title of this question. I'm sure there's a Perfectly Reasonable Explanation for why Php thinks that 0 == '%' (or any other special character, I think). I thought it would be good to get that explanation on StackOverflow!

推荐答案

使用'==='精确，字面比较 - 值必须是相同的类型，也是等于）而不是'=='解决这个问题。 ==试图将％转换为数字，0是最好的。

Using '===' (for exact, literal comparison -- the values must be the same type and also equal) instead of '==' solves this problem. With '==' it's trying to cast '%' to a number and 0 is the best it can do.

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