<?php
//拦截器的使用
class Computer{
private $name;
private $price;
private $cpu;
private $clocked;

//拦截器之赋值
public function __set($key,$value){
//那么：$key=name $value="联想" 则有： $this->name="联想"
return $this->$key=$value;
}

//拦截器之取值
public function __get($key){
if (isset($key)){
//那么： $key=name 则$this->name 所以自然就return了"联想"
return $this->$key;
}else {
return NULL;
}
}
}
//正是因为的拦截器存在，才能如此用
$computer=new Computer();
$computer->name="联想";
$computer->price=5600;
$computer->cpu="八核";
$computer->clocked="1600hz";

echo $computer->name;
echo $computer->price;
echo $computer->cpu;
echo $computer->clocked;