The Serializable interface

Domains: PHP


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.

Interface synopsis

Serializable {
/* Methods */
abstract public serialize ( void ) : string
abstract public unserialize ( string $serialized ) : void

Example #1 Basic usage

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);


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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