serialize将实例转化为字符串, unserialize() 还原已经序列化的对象

<?php

//serialize.php

//声明一个类

class dog {

    var $name;

    var $age;

    var $owner;

    function dog($in_name="unnamed",$in_age="0",$in_owner="unknown") {

        $this->name = $in_name;

        $this->age = $in_age;

        $this->owner = $in_owner;

    }

    function getage() {

        return ($this->age * 365);

    }

    function getowner() {

        return ($this->owner);

    }

    function getname() {

        return ($this->name);

    }

}

//实例化这个类

$ourfirstdog = new dog("Rover",12,"Lisa and Graham");

var_dump($ourfirstdog);

//用serialize函数将这个实例转化为一个序列化的字符串

$dogdisc = serialize($ourfirstdog);

print $dogdisc; //$ourfirstdog 已经序列化为字符串 O:3:"dog":3:{s:4:"name";s:5:"Rover";s:3:"age";i:12;s:5:"owner";s:15:"Lisa and Graham";}

print '<BR>';

/*

-----------------------------------------------------------------------

    在这里你可以将字符串 $dogdisc 存储到任何地方如 session,cookie,数据库,php文件

-----------------------------------------------------------------------

*/

//我们在此注销这个类

unset($ourfirstdog);

echo '<hr><hr>';

/*    还原操作   */

/*

-----------------------------------------------------------------------

    在这里将字符串 $dogdisc 从你存储的地方读出来如 session,cookie,数据库,php文件

-----------------------------------------------------------------------

*/

//我们在这里用 unserialize() 还原已经序列化的对象

$pet = unserialize($dogdisc); //此时的 $pet 已经是前面的 $ourfirstdog 对象了

var_dump($pet);

//获得年龄和名字属性

$old = $pet->getage();

$name = $pet->getname();

//这个类此时无需实例化可以继续使用,而且属性和值都是保持在序列化之前的状态

print "Our first dog is called $name and is $old days old<br>";

print '<BR>';

?>

object(dog)[1]
public 'name' =>  'Rover' (length=5)
public 'age' =>  12
public 'owner' =>  'Lisa and Graham' (length=15)

O:3:"dog":3:{s:4:"name";s:5:"Rover";s:3:"age";i:12;s:5:"owner";s:15:"Lisa and Graham";}

object(dog)[1]
public 'name' =>  'Rover' (length=5)
public 'age' =>  12
public 'owner' =>  'Lisa and Graham' (length=15)

Our first dog is called Rover and is 4380 days old