(PHP 5 >= 5.1.0, PHP 7, PHP 8)
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.
abstract public serialize ( ) : string
abstract public unserialize ( string $serialized ) : void}
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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https://www.php.net/manual/en/class.serializable.php