PHP 5.6.0beta1 released

The Serializable interface

(PHP 5 >= 5.1.0)

Introducere

Interface for customized serializing.

Classes that implement this interface no longer support __sleep() and __wakeup(). The method serialize is called whenever an instance needs to be serialized. This does not invoke __destruct() or has any other side effect unless programmed inside the method. When the data is unserialized the class is known and the appropriate unserialize() method is called as a constructor instead of calling __construct(). If you need to execute the standard constructor you may do so in the method.

Descrierea succintă a interfeței

Serializable {
/* Metode */
abstract public string serialize ( void )
abstract public void 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);

var_dump($ser);

$newobj unserialize($ser);

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

Exemplul de mai sus va afișa ceva similar cu:

string(38) "C:3:"obj":23:{s:15:"My private data";}"
string(15) "My private data"

Cuprins

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User Contributed Notes 3 notes

up
5
Anonymous
2 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
1
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
0
Anonymous
2 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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