将布尔值或null放在比较运算符之前的原因是什么? [英] What is a reason of placing boolean or null before comparison operator?

问题描述

在PHP中，将布尔值或null放在相同比较运算符之前的根本原因是什么?

In PHP, what is an underlying reason of placing either boolean or null before identical comparison operator?

false === $value;   
null === $value;

在我看来，这和说的一样

It seems to me that it is same as saying

$value === false;

这是个人喜好还是人们这样做的具体原因?

Is it just a personal preference or there is a concrete reason why people do this?

推荐答案

这是避免误分配变量的惯例.

It's a convention to avoid the mistake of accidentally assigning a variable.

$value = false;

代替

$value === false;

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