PHP 5.5.16 is released

L'interface Serializable

(PHP 5 >= 5.1.0)

Introduction

Interface permettant de personnaliser la linéarisation.

Les classes implémentant cette interface ne supportent plus __sleep() et __wakeup(). La méthode de linéarisation est appelée chaque fois qu'une instance doit être linéarisée. Elle n'appelle pas la méthode __destruct() et n'a aucun effet sur le contenu de cette méthode. Lorsque les données sont linéarisées, la classe est connue et la méthode unserialize() appropriée est appelée comme constructeur au lieu d'appeler __construct(). Si vous devez appeler le constructeur standard, vous pouvez le faire dans la méthode.

Sommaire de l'Interface

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

Exemple #1 Exemple simple

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

$obj = new obj;
$ser serialize($obj);

var_dump($ser);

$newobj unserialize($ser);

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

L'exemple ci-dessus va afficher quelque chose de similaire à :

string(38) "C:3:"obj":23:{s:19:"Mes données privées";}"
string(19) "Mes données privées"

Sommaire

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User Contributed Notes 4 notes

up
8
Anonymous
3 years ago
You cannot throw an exception inside the serialize() method.  This will cause PHP to complain that you are not returning a string or NULL.

The best way to prevent the serialization of an object is to throw an Exception in the __sleep() method:

<?php
class Obj {
  public function
__sleep() {
    throw new
BadMethodCallException('You cannot serialize this object.');
  }
}
?>
up
3
marcos dot gottardi at folha dot REM0VE-THIS dot com dot br
2 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
-1
Olivier Pons
3 months 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
-3
Anonymous
3 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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