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<?php class Role implements \Serializable { protected $id = 0; protected $b = null; public function __construct($id) { $this->id = $id; } public function serialize() { return serialize([$this->id, $this->b]); } public function unserialize($serialized) { list($this->id, $this->b) = unserialize($serialized); } } class AbstractToken implements \Serializable { public $role1; public $role2; public function __construct($role) { $this->role1 = $role; $this->role2 = $role; } public function serialize() { return serialize([$this->role1, $this->role2]); } public function unserialize($serialized) { list($this->role1, $this->role2) = unserialize($serialized); } } class Token extends AbstractToken { public $id; public function __construct($id, $role) { $this->id = $id; parent::__construct($role); } public function serialize() { return serialize([$this->id, parent::serialize()]); } public function unserialize($serialized) { list($this->id, $parentStr) = unserialize($serialized); parent::unserialize($parentStr); } } $token = new Token(1, new Role(1)); $s = serialize($token); $broken = unserialize($s); var_dump($token->role2); var_dump($broken->role2); exit;