了解PHP的OOP魔术方法__set（）和__get（）

Question

I am having difficulty understanding the magic methods in object oriented PHP - for example, __set() :

<?php
class Post{
    private $name;

    public function __set($name, $value){
        echo 'Setting '.$name.' to <strong>'.$value.'</strong><br />';
        $this->name = $value;
    }
}

$post = new Post;
$post->name = 'Testing';
?>

This prints out:

Setting name to Testing

What I am not understanding is why did $name change to "name" inside __set() ?

I would also like some explanation in plain English on how and why to use __set() and __get() .

Answer 1

$name changed to $this->name , not to name . In $this->name it is a property of object $this .

Normally you would never use __get() and __set() . They can be used, for instance, in error handling to get access to an inaccessable or private properties, like your name property.