Serialization of objects in php, php object serialization_PHP tutorial

Serialization of objects in php, php object serialization

We all know that PHP serialization can convert variables, including objects, into continuous bytes data. You can Store the serialized variables in a file or transmit them over the network, and then deserialize them back to the original data. This article gives you a detailed introduction to PHP serialization. PHP can successfully store the properties and methods of a class that you define before deserializing its object. Sometimes you may need an object to be executed immediately after deserializing it. For such purposes, PHP automatically looks for the __sleep and __wakeup methods.

When an object is serialized by PHP, PHP will call the __sleep method (if it exists). After deserializing an object, PHP will call the __wakeup method. Neither method accepts parameters. __sleep method Must return an array containing the attributes that need to be serialized. PHP will discard the values ​​​​of other attributes. Without the __sleep method, PHP will save all attributes. ​

<?<span>php
</span><span>/*</span><span>
 * 
 * @Authors peng--jun 
 * @Email   1098325951@qq.com
 * @Date    2016-01-23 14:40:38
 * @Link    </span><span>http://www.cnblogs.com/xs-yqz/</span><span>
 * @version $Id$
 ==========================================
 </span><span>*/</span><span>
 header(</span><span>"</span><span>Content-type: text/html; charset=UTF-8</span><span>"</span><span>); 
 </span><span>class</span><span> Person{
     </span><span>private</span><span> $name;
     </span><span>private</span><span> $sex;
     </span><span>private</span><span> $age;

     function __construct($name,$age,$sex){
         $</span><span>this</span>->name =<span> $name;
         $</span><span>this</span>->age =<span> $age;
         $</span><span>this</span>->sex =<span> $sex;
     }
     function say(){
         echo </span><span>"</span><span>我的名字：</span><span>"</span>.$<span>this</span>->name.<span>"</span><span>性别为: </span><span>"</span>.$<span>this</span>->sex.<span>"</span><span>年龄为：</span><span>"</span>.$<span>this</span>-><span>age;
     }

　　　<span>//在类中添加此方法，在串行化的时候自动调用并返回数组</span>
     function __sleep(){
     $arr </span>= array(<span>"</span><span>name</span><span>"</span>,<span>"</span><span>age</span><span>"</span>);<span>//</span><span>数组中的成员$name和$age将被串行化，成员$sex则将被忽略。</span>
     <span>return</span><span>($arr);<span>//使用__sleep()方法的时候必须返回一个数组。</span>
    }
<span>    //在反串行化对象时自动调用该方法，没有参数也没有返回值</span>
    function __wakeup(){
        $</span><span>this</span>->age = <span>40</span><span>;<span>//在重新组织对象的时候，为新对象中的$age属性重新赋值</span>
    }
}

 $person1 </span>= <span>new</span> Person(<span>"</span><span>张三</span><span>"</span>,<span>20</span>,<span>"</span><span>男</span><span>"</span><span>);
 $person1_string </span>=<span> serialize($person1);
 echo $person1_string.</span><span>"</span><span><br /></span><span>"</span><span>;

</span><span>//</span><span>反串行化对象，并自动调用了__wakeup()方法重新为独享中的age赋值。</span>
$person2 =<span> unserialize($person1_string);
$person2</span>-><span>say();

 </span>?>

The output result is:

O:<span>6</span>:<span>"</span><span>Person</span><span>"</span>:<span>2</span>:{s:<span>12</span>:<span>"</span><span>Personname</span><span>"</span>;s:<span>6</span>:<span>"</span><span>张三</span><span>"</span>;s:<span>11</span>:<span>"</span><span>Personage</span><span>"</span>;i:<span>20</span><span>;}
我的名字：张三性别为: 年龄为：</span><span>40</span>

2. Save the serialized string to the file, read the string from the file, and deserialize the instance.

 header(<span>"</span><span>Content-type: text/html; charset=UTF-8</span><span>"</span><span>); 
 </span><span>class</span><span> Person{
     </span><span>private</span><span> $name;
     </span><span>private</span><span> $sex;
     </span><span>private</span><span> $age;

     function __construct($name,$age,$sex){
         $</span><span>this</span>->name =<span> $name;
         $</span><span>this</span>->age =<span> $age;
         $</span><span>this</span>->sex =<span> $sex;
     }
     function say(){
         echo </span><span>"</span><span>我的名字：</span><span>"</span>.$<span>this</span>->name.<span>"</span><span>性别为: </span><span>"</span>.$<span>this</span>->sex.<span>"</span><span>年龄为：</span><span>"</span>.$<span>this</span>-><span>age;
     }
 }

 $person1 </span>= <span>new</span> Person(<span>"</span><span>张三</span><span>"</span>,<span>21</span>,<span>"</span><span>男</span><span>"</span><span>);
 $person1_string </span>=<span> serialize($person1);
 file_put_contents(</span><span>"</span><span>file.txt</span><span>"</span>, $person1_string);<br /><br />

 header(<span>"</span><span>Content-type: text/html; charset=UTF-8</span><span>"</span><span>); 
  </span><span>class</span><span> Person{
     </span><span>private</span><span> $name;
     </span><span>private</span><span> $sex;
     </span><span>private</span><span> $age;

     function __construct($name,$age,$sex){
         $</span><span>this</span>->name =<span> $name;
         $</span><span>this</span>->age =<span> $age;
         $</span><span>this</span>->sex =<span> $sex;
     }
     function say(){
         echo </span><span>"</span><span>我的名字:</span><span>"</span>.$<span>this</span>->name.<span>"</span><span> 性别为:</span><span>"</span>.$<span>this</span>->sex.<span>"</span><span> 年龄为:</span><span>"</span>.$<span>this</span>-><span>age;
     }
 }

 $person2_string </span>= file_get_contents(<span>"</span><span>file.txt</span><span>"</span><span>);
 $person2 </span>=<span> unserialize($person2_string);<span>//反串性化重新形成对象$person2.</span>
 $person2</span>-><span>say();
</span>?>

http://www.bkjia.com/PHPjc/1094586.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1094586.htmlTechArticleSerialization of objects in php, php object serialization We all know that PHP serialization can convert variables Including objects, converted into continuous bytes data, you can store the serialized variables in a...