成员变量的默认值 [英] Default value of member variables

问题描述

PHP中类成员变量的默认值是什么?

What is the default value of class member variables in PHP?

为什么我经常看到:

public static $variable = null;

不够吗?

public static $variable;

推荐答案

可以，但是有些人不知道，或者宁愿露骨.

It would, but some people either don't know that, or prefer to be explicit.

一个常见的约定是，当程序员依赖该空值时，将其初始化为null；如果在读取该成员之前对其进行了写入，则不将其初始化为null.

A common convention is to initialize to null when the programmer relies on that null value and do not initialize to null if that member is written to before being read.

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