PHP中奇怪的打印行为? [英] Strange print behaviour in PHP?

问题描述

为什么下面的代码输出128?

Why does the following code output 128?

<?php 
    print 4 << 5; 
?>

推荐答案

因为它是按位运算符.我认为这表示4乘以2 ^ 5，因为该运算符表示

Because it's a bitwise operator. I think it means 4 multiplied to 2^5 because that operator means

将$ a $ b步骤的位向左移动(每个步骤表示乘以 被两个")

Shift the bits of $a $b steps to the left (each step means "multiply by two")

这是五个步骤.是4 * 2 * 2 * 2 * 2 * 2(但是我在这里猜测；一切都发生在位级别).

so it's five steps. It's 4 * 2 * 2 * 2 * 2 * 2 (But I'm guessing here; everything happens at bit level).

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