公共，私人和受保护的有什么区别? [英] What is the difference between public, private, and protected?

问题描述

何时以及为何在类内使用public，private和protected函数和变量?它们之间有什么区别?

When and why should I use public, private, and protected functions and variables inside a class? What is the difference between them?

示例:

// Public
public $variable;
public function doSomething() {
  // ...
}

// Private
private $variable;
private function doSomething() {
  // ...
}

// Protected
protected $variable;
protected function doSomething() {
  // ...
}

推荐答案

您使用:

• public范围使该属性/方法可从任何位置，对象的其他类和实例使用.

• public scope to make that property/method available from anywhere, other classes and instances of the object.

private范围.

protected范围.

更多 :(有关全面信息)

More: (For comprehensive information)

• PHP手册-可见性

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