PHP运算符<< [英] PHP Operator <<

问题描述

<<是什么?运算符在php中是什么意思?

What does the << Operator mean in php?

示例:

$t = 5;
$foo = 1 << ($t);
echo($foo); 

回声产生:32

谢谢

推荐答案

它是按位移位运算符.具体来说，是左移运算符.它采用左手参数，并将二进制表示形式向左移动右手参数指定的位数，例如:

It is the bitwise shift operator. Specifically, the left-shift operator. It takes the left-hand argument and shifts the binary representation to the left by the number of bits specified by the right-hand argument, for example:

1 << 2 = 4

因为1(十进制)是1(二进制)；左移两次使它成为100，这是十进制的4.

because 1 (decimal) is 1 (binary); left-shift twice makes it 100 which is 4 in decimal.

1 << 5 = 32

因为二进制文件中的100000是十进制中的32.

because 100000 in binary is 32 in decimal.

右移(>>)的功能相同，但向右移动.

Right shift (>>) does the same thing but to the right.

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