PHP 7.1.0 Release Candidate 3 Released

序列化接口

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简介

自定义序列化的接口。

实现此接口的类将不再支持 __sleep()__wakeup()。不论何时,只要有实例需要被序列化,serialize 方法都将被调用。它将不会调用 __destruct() 或有其他影响,除非程序化地调用此方法。当数据被反序列化时,类将被感知并且调用合适的 unserialize() 方法而不是调用 __construct()。如果需要执行标准的构造器,你应该在这个方法中进行处理。

接口摘要

Serializable {
/* 方法 */
abstract public string serialize ( void )
abstract public mixed unserialize ( string $serialized )
}

Example #1 Basic usage

<?php
class obj implements Serializable {
    private 
$data;
    public function 
__construct() {
        
$this->data "My private data";
    }
    public function 
serialize() {
        return 
serialize($this->data);
    }
    public function 
unserialize($data) {
        
$this->data unserialize($data);
    }
    public function 
getData() {
        return 
$this->data;
    }
}

$obj = new obj;
$ser serialize($obj);

$newobj unserialize($ser);

var_dump($newobj->getData());
?>

以上例程的输出类似于:

string(15) "My private data"

Table of Contents

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User Contributed Notes 5 notes

up
6
grzeniufication
10 months ago
Here's an example how to un-, serialize more than one property:

class Example implements \Serializable
{
    protected $property1;
    protected $property2;
    protected $property3;

    public function __construct($property1, $property2, $property3)
    {
        $this->property1 = $property1;
        $this->property2 = $property2;
        $this->property3 = $property3;
    }

    public function serialize()
    {
        return serialize([
            $this->property1,
            $this->property2,
            $this->property3,
        ]);
    }

    public function unserialize($data)
    {
        list(
            $this->property1,
            $this->property2,
            $this->property3
        ) = unserialize($data);
    }

}
up
0
Wojciech Brozyna
1 month ago
My solution that let you serialize inherited objects.
Without specify what need to be serialized.
We want to get rid of PDO object in this example.

abstract class DefaultModel() implements \Serializable
{

    /**
    * @var PDO
    */
    private $pdo;

    /**
     * Serialize object
     *
     * @return string
     */
    public function serialize()
    {
       
        $serializable = get_object_vars($this);
       
        // unset property name that hold PDO instance
        unset($serializable['pdo']);
       
        return serialize($serializable);
       
    }

    /**
     * Unserialize object
     *
     * @param string $serialized Serialized object
     * @return DefaultModel
     */
    public function unserialize($serialized)
    {
       
        $unserialized = unserialize($serialized);
       
       // recreate PDO object
        $this->pdo = $this->createDBObject();
       
        if(is_array($unserialized) === true) {
           
            foreach($unserialized as $property => $value) {
               
                $this->{$property} = $value;
               
            }
           
        }
       
    }

}

class RealModel extends DefaultModel
{

    private $myVar;

    public function setMyVar($value)
    {

        $this->myVar = $value;

    }

}

$model = new RealModel();
$model->setMyVar('123456');

$serialized = serialize($model);
$serialized = $model->serialize();   // will also work

print_r($serialized);

$unserialized = unserialize($serialized);

print_r($unserialized);

Hope this help.
up
-1
marcos dot gottardi at folha dot REM0VE-THIS dot com dot br
4 years ago
Serializing child and parent classes:

<?php
class MyClass implements Serializable {
    private
$data;
   
    public function
__construct($data) {
       
$this->data = $data;
    }
   
    public function
getData() {
        return
$this->data;
    }
   
    public function
serialize() {
        echo
"Serializing MyClass...\n";
        return
serialize($this->data);
    }
   
    public function
unserialize($data) {
        echo
"Unserializing MyClass...\n";
       
$this->data = unserialize($data);
    }
}

class
MyChildClass extends MyClass {
    private
$id;
    private
$name;
   
    public function
__construct($id, $name, $data) {
       
parent::__construct($data);
       
$this->id = $id;
       
$this->name = $name;
    }
   
    public function
serialize() {
        echo
"Serializing MyChildClass...\n";
        return
serialize(
            array(
               
'id' => $this->id,
               
'name' => $this->name,
               
'parentData' => parent::serialize()
            )
        );
    }
   
    public function
unserialize($data) {
        echo
"Unserializing MyChildClass...\n";
       
$data = unserialize($data);
       
       
$this->id = $data['id'];
       
$this->name = $data['name'];
       
parent::unserialize($data['parentData']);
    }
   
    public function
getId() {
        return
$this->id;
    }
   
    public function
getName() {
        return
$this->name;
    }
}

$obj = new MyChildClass(15, 'My class name', 'My data');

$serial = serialize($obj);
$newObject = unserialize($serial);

echo
$newObject->getId() . PHP_EOL;
echo
$newObject->getName() . PHP_EOL;
echo
$newObject->getData() . PHP_EOL;

?>

This will output:

Serializing MyChildClass...
Serializing MyClass...
Unserializing MyChildClass...
Unserializing MyClass...
15
My class name
My data
up
-4
Olivier Pons
2 years ago
Here's the way you could implement serializable so that *ALL* descendant serialize themselves without the need of re-writing for all descendant the functions serialize() and unserialize().

Note : this will only serialize "visible" properties, this it won't serialize private descendant properties. If you dont want a property of a descendant to be serialized, make it private.

class Pot implements Serializable
{
    protected $_a;
    protected $_b;

    public function serialize()
    {
        return serialize(get_object_vars($this));
    }
    public function unserialize($data)
    {
        $values = unserialize($data);
        foreach ($values as $key=>$value) {
            $this->$key = $value;
        }
    }
}

And now one descendant:

class PotId implements Pot
{
    protected $_k;
}

class Pots implements PotId
{
    protected $_l;
}

$pots = new Pots();

and calling serialize($pots) will serialize all properties ($_a, $_b, $_k, $l).
up
-6
Anonymous
5 years ago
You can prevent an object getting unserialized by returning NULL. Instead of a serialized object, PHP will return the serialized form of NULL:

<?php
class testNull implements Serializable {
    public function
serialize() {       
        return
NULL;
    }
    public function
unserialize($data) {
    }
}

$obj = new testNull;
$string = serialize($obj);
echo
$string; // "N;"
?>

That's perhaps better than throwing exceptions inside of the serialize function if you want to prevent serialization of certain objects.
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