A brief discussion on the understanding and use of __set() and __get() in PHP interceptors_php examples

"Generally speaking, always define the attributes of a class as private, which is more in line with realistic logic.

However, reading and assigning operations to attributes are very frequent, so in PHP5, two functions "__get()" and "__set()" are predefined to obtain and assign their attributes, as well as " __isset()" and the method to delete attributes "__unset()".

We have set and get methods for each attribute. PHP5 provides us with special methods for setting and getting values ​​for attributes, "__set()" and "__get()". These two methods This method does not exist by default, but we add it to the class manually. Like the constructor method (__construct()), it will only exist if it is added to the class. You can add these two methods in the following way. Of course, You can add it according to your personal style: "

<&#63;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;

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