014对象——对象 __isset __unset __sleep __wakeup

<?php

/**
 *
 */
/*class lantian
{
    public $name;
    public $age;
    private $money;
    public $c;
    function __construct($name, $arg = '', $money)
    {
        $this->name = $name;
        $this->age = $arg;
        $this->money = $money;
    }

    function __isset($var)
    {
        //设置可以在外面检验的变量
        $array = array('name', 'age');
        if (in_array($var, $array)) {
            // return isset($this->money);
            echo $var . "属性存在，他的值是：" . $this->$var;
        } elseif (in_array($var, array_keys(get_object_vars($this)))) {
            echo "变量不允许外部检测";
            return;
        } else {
            echo "属性不存在";
        }
    }
    //利用魔术：__unset()可以删除私有的属性
    function __unset($c)
    {
        if ($c=='age'){
            unset($this->$c);
            echo "删除属性{$c}成功";
        }else{
            echo "不允许删除属性{$c}";
        }
    }
    function get_money(){
        echo $this->money;
    }
}

$lisi = new lantian("李四", 22, 5500);

//isset($lisi->name);

//获取当前的页码
//echo isset($_GET['page'])?$_GET['page']:1;
$lisi->c=200;
//echo $lisi->c;
unset($lisi->age);
//echo $lisi->get_money();*/

/*$array1=array('php','html','mysql');
$str=serialize($array1);//serialize() 产生一个可存储的值的表示。序列化数据
$array2=unserialize($str);//unserialize() 从已存储的表示中创建 PHP 的值。反序列化
print_r($array2);*/

/*class db{
    private $host;
    private $user;
    private $pwd;
    private $dbname;
    function __construct($host,$user,$pwd,$dbname)
    {
        $this->host=$host;
        $this->user=$user;
        $this->pwd=$pwd;
        $this->dbname=$dbname;
        $this->db();
    }
    function db(){
        $mysqli=new mysqli($this->host,$this->user,$this->pwd,$this->dbname);
    }
    function select(){
        $sql="SELECT cate_id,cate_name FROM blog_category";
        $result=$this->mysqli->query($sql);
        while ($row=$result->fetch_assoc()){
            $rows[]=$row;
        }
        print_r($rows);
    }
    //反序列化魔术函数
    function __wakeup()
    {
        $this->db();
    }
}
session_start(); //打开session();
$chanel=new db('localhost','root','','blog');
//$chanel->select();
//保存查找的内容，进行序列化，在别的页面进行调用：
//$chanel_obj=serialize($chanel);
//var_dump($chanel_obj);

$_SESSION['chanel_obj']=serialize($chanel); //保存序列化之后的数据到session中。
echo serialize($chanel);*/

//
class ren{
    private $name;
    private $age;
    function __construct($name,$age)
    {
        $this->name=$name;
        $this->age=$age;
    }
    function show(){
        echo "姓名是：{$this->name}  年龄是：{$this->age}";
    }
    //魔术方法：__sleep()指定序列化的属性
    function __sleep()
    {
        //return array('name','age');  //获取类的属性：
        print_r(array_keys(get_object_vars($this)));//get_object_vars()获取对象的变量属性：
    }
}
$zao=new ren('赵六',22);
echo serialize($zao);

　　

<?php
/**
 */
session_start();
include '14.php';
$channel_obj=unserialize($_SESSION['channel_obj']);
$channel_obj->select();