The use of serialization in PHP

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<?
	/*
		作者 : shyhero
		邮箱 : shyhero@
		Q  Q : 1757424878

	 */
	class Person{				//声明一个Person类
		public $age;
		private $name;
		protected $sex;

		public function __construct($age="",$name="",$sex=""){
			$this -> age = $age;
			$this -> name = $name;
			$this -> sex = $sex;
		}

		public function say(){
			return $this -> age." ".$this -> name." ".$this -> sex;
		}

		function __sleep(){		//指定串行化时能提取的成员属性,没有参数,但是必须返回一个数组
			$arr = array("age","name");
			return $arr;
		}

		function __wakeup(){	//指定反串行化时,提取出来的值
			$this -> sex = "woman";
		}
	}

2. [code][PHP] code Jump to [1] [2] [3] [Full screen preview]

<?
	require("./Person.class.php");

	$p = new Person(21,"du","man");	//定义Person类对象
	$pString = serialize($p);	//对对象进行串行化
	file_put_contents("./file.txt",$pString);//存到文件里

3. [code][PHP] code Jump to [1] [2] [3] [Full screen preview]

<?
	require("./Person.class.php");//反串行化时,也要包含原类

	$pString = file_get_contents("./file.txt");//从文件中取出串行化的值
	$p = unserialize($pString);//进行反串行化	
	var_dump($p);	//这个 $p就是之前那个串行化的对象,一样用,但是里面的值被我改了