The Serializable interface

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

Introduction

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 have 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.

Warning

As of PHP 8.1.0, a class which implements Serializable without also implementing __serialize() and __unserialize() will generate a deprecation warning.

Interface synopsis

interface Serializable {
/* Methods */
public serialize(): ?string
public unserialize(string $data): void
}

Examples

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());
?>

The above example will output something similar to:

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

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User Contributed Notes 4 notes

up
85
grzeniufication
8 years 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
12
shaun at slickdesign dot com dot au
6 years ago
Serialized strings differ between instances that implement Serializable and those that don't.

Instances that don't implement Serializable use the Object notation "O:" when serialized, while those that do use the Class notation "C:". Class notation can only be used to unserialize instances that implement Serializable, while the Object notation can be used to unserialize any object.

Because of this, it is sometimes useful to implement the __wakeup() function when implementing Serializable, for instances where you may have a copy of the serialised class before it implemented Serializable (backwards compatible), or when you're expecting a serialized object from an external source, and they use Object notation for maximum compatibility. You can also use __wakeup() to process your unserialize function, or use it to help prevent people trying to bypass your unserialize.

Below is an example of a simple class hierarchy, where A is a standard class, B implements Serializable, and C uses __wakeup() to assist with unserializing it.

<?php
class A {
protected
$readonly_data = true;
public
$public_data = true;

public function
__construct( $data = true ) {
$this->public_data = $data;
}

public function
get_readonly_data() {
return
$this->readonly_data;
}
}

$a = new A;

var_dump( $a );
//object(A)#1 (2) {
// ["readonly_data":protected]=>
// bool(true)
// ["public_data"]=>
// bool(true)
//}
var_dump( serialize( $a ) );
//string(63) "O:1:"A":2:{s:16:"*readonly_data";b:1;s:11:"public_data";b:1;}"
?>
Class A outputs the following object, and its serialized string uses the object notation "O:". Please note that there is a null byte "\0" either side of the star*.

Changing the serialised string and unserializing it can cause protected and private values to change.
<?php
var_dump
( unserialize( "O:1:\"A\":2:{s:16:\"\0*\0readonly_data\";b:0;s:11:\"public_data\";b:0;}" ) );
//object(A)#1 (2) {
// ["readonly_data":protected]=>
// bool(false)
// ["public_data"]=>
// bool(false)
//}
?>

Class B extends A, and so has the same constructor and properties. It also implements Serializable.
<?php
class B extends A implements Serializable {
public function
serialize() {
return
serialize( $this->public_data );
}

public function
unserialize( $data ) {
$this->public_data = unserialize ( $data );
do_extra_processing_here();
}
}

$b = new B;

var_dump( serialize( $b ) );
// C:1:"B":4:{b:1;}
?>
As well as being a lot shorter, the serialized string uses the Class notation "C:", but you can still unserialize it using the older style notation. Doing this however will completely ignore the unserialize() function, potentially update the wrong information, and the function do_extra_processing_here() from the example above is not called.
<?php
var_dump
( unserialize( "O:1:\"B\":2:{s:16:\"\0*\0readonly_data\";b:0;s:11:\"public_data\";b:0;}" ) );
//object(B)#1 (2) {
// ["readonly_data":protected]=>
// bool(false)
// ["public_data"]=>
// bool(false)
//}
?>

Class C extends B, so it's already using the serialize() and unserialize() functions. By implementing the __wakeup() method, we ensure that we are validating the information and performing our do_extra_processing_here() function.
<?php
class C extends B {
public function
__wakeup() {
$new = new static;
$this->readonly_data = $new->get_readonly_data();
do_extra_processing_here();
}
}

var_dump( unserialize( "O:1:\"C\":2:{s:16:\"\0*\0readonly_data\";b:0;s:11:\"public_data\";b:0;}" ) );
//object(B)#1 (2) {
// ["readonly_data":protected]=>
// bool(true)
// ["public_data"]=>
// bool(false)
//}
?>
We can use __wakeup() to revert our readonly data back to what it was, or to add additional processing. You can additionally call __wakeup() from within unserialize() if you need to do the same process regardless of which serialized string notation was used.
up
8
info at ensostudio dot ru
4 years ago
Note: that interface declared as "deprecated" in PHP 7.4, use magic methods __serialize() and __unserialize() instead .
up
2
marcos dot gottardi at folha dot REM0VE-THIS dot com dot br
12 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
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