PHP 通过$this 传递对象

[asp]代码库

<!-- 通过$this 传递对象 
在这个例子中,我们写一个根据不同的年龄发不同工资的类.
我们设置处理年龄和工资的业务模型为一个独立的类.
-->
<?
class User{
	private $age ; 
	private $sal ;
	private $payoff ; //声明全局属性.
	
	//构造函数,中创建Payoff的对象.
	public function __construct(){
		$this->payoff = new Payoff();
	}	
	public function getAge(){
		return $this->age;
	}
	public function setAge($age){
		$this->age = $age;
	}	
	// 获得工资.
	public 	function getSal(){
		$this->sal =  $this->payoff->figure($this);
		return $this->sal;
	}
}
//这是对应工资与年龄关系的类.
class Payoff{
	public function figure($a){
		$sal =0;
		$age = $a->getAge();
		if($age >80 || $age <16 ){
			$sal = 0;
		}elseif ($age > 50){
			$sal = 1000;
		}else{
			$sal = 800;
		}
		return $sal;
	}
}
//实例化User
$user = new User();
$user->setAge(55);
echo $user->getAge()."age ,his sal is " . $user->getSal();
echo "<br>";
$user->setAge(20);
echo $user->getAge()."age , his sal is " . $user->getSal();
echo "<br>";
$user->setAge(-20);
echo $user->getAge()."age , his sal is " . $user->getSal();
echo "<br>";
$user->setAge(150);
echo $user->getAge()."age , his sal is " . $user->getSal();
?>