在PHP中的点运算符(Dot operator in PHP)

在PHP中的点运算符(Dot operator in PHP)

我以为我认识字符串操作符 . 直到今天我被问及一个关于它的问题。 这个问题看起来很简单：

echo 100...100;

乍一看，我认为这会造成语法错误。 但是当我运行代码并看到结果时，我完全困惑。 结果是

1000.1

所以我想知道这是怎么发生的？

谢谢。

I thought I've known the String Operator . well enough until I was asked a question about it today. The question looks quite simple:

echo 100...100;

At the first glance I thought it would make a syntax error. But when I ran the code and saw the result I was totally confused. The result is

1000.1

So I wonder how could this happen?

Thanks.

最满意答案

像这样读取它：

(100.) . (.100)

因此它连接100和0.1 。

Read it like this:

(100.) . (.100)

Thus it concats 100 and 0.1.