_unset()这是如何了

__unset()这是怎么了

class Person {<br />
		private $name;<br />
		private $age;<br />
		private $sex;<br />
		//2. 构造方法		//作用: 给对象属性初始值<br />
		function __construct($name='', $age='0', $sex='男'){	<br />
			$this->name=$name;<br />
			$this->age=$age;<br />
			$this->sex=$sex;<br />
		}<br />
		private function __set($proName, $proValue){<br />
			if($proName == 'age'){<br />
				if($proValue<0 || $proValue>100){<br />
					echo  '设置的年龄不合法';<br />
					return;<br />
				}else{<br />
					 $this->$proName=$proValue;<br />
					echo $this->age.'<br />';<br />
				}<br />
			}<br />
		}<br />
		private function __get($proName){<br />
			if($proName == 'age'){<br />
				echo ($this->$proName-20).'<br />';<br />
			}<br />
		}<br />
		private function __isset($proName){<br />
			if(isset($this->$proName)){<br />
				echo $this->$proName.'存在<br />';<br />
				return;<br />
			}<br />
				echo $proName.'不存在<br />';<br />
		}<br />
		private function __unset($proName){<br />
			unset($this->$proName);<br />
		}<br />
		function say(){<br />
			echo 'name........'.$this->name.'|age.........'.$this->age.'|sex..........'.$this->sex.'<br />';<br />
		}<br />
		function __destruct(){<br />
		}<br />
	}<br />
	$p1 = new Person('yeteng', 26, '男');<br />
	$p2 = new Person('yeben', 28, '男');<br />
	$p3 = new Person('wenjing', 40, '女');<br />
	$p1->age=99;		//自动触发__set<br />
	$p1->age;				//自动触发__get<br />
	isset($p1->name);//自动触发__isset<br />
<br />
	unset($p1->age);	//自动触发__unset<br />
	$p1->say();

------解决方案--------------------
全部的魔术方法都必须是全局的(public)