受保护的属性带有下划线 [英] Protected properties prefixed with underscores

问题描述

Like：

public
  $foo        = null,
  $bar        = 10;

protected

  $_stuff     = null,
  $_moreStuff = 5;

很多人似乎这样做。为什么？

A lot of people seem to do this. Why?

这不一致的命名（像一些PHP函数是：））？

Isn't this inconsistent naming (like some PHP functions are :))?

推荐答案

这真的是一件事：个人喜好。

It really comes down to one thing: personal preference.

我个人，也是一个使用命名约定的人。使用下划线（无论是变量还是函数）来前缀任何 protected 或 private ，允许自己和任何其他我经常工作的程序员知道该变量是全局的，并且不能在当前类/上下文之外访问。

I, personally, am also one who uses that naming convention. Prefixing anything that is protected or private with an underscore, be it a variable or a function, lets myself and any other programmer who I regularly work with know that that variable is global and will not be accessible outside of the current class/context.

一个有助于澄清用例的示例是类方法：

An example that helps clarify the use-case would be with class methods:

class Example {
    public function firstFunction() {
        // do stuff
    }

    protected function _secondFunction() {
        // do more stuff
    }
}

当我编写使用类 Example 的代码或者在类本身内部工作时，如果我看到 _secondFunction（）我会马上知道它不是一个公共函数，因为开始 _ 可在类外访问;不需要去找到实际的函数声明并查看修饰符。另一方面，我会知道 firstFunction（）是公共的，因为它不以一个开头。

When I'm writing code that uses the class Example, or working inside of the class itself, if I see _secondFunction() I will immediately know that it's not a public function because of the starting _ and thereby not accessible outside of the class; no need to go and find the actual function declaration and see the modifier. On the flip side, I will know that firstFunction() is public because it doesn't begin with one.

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