note 80173 added to language.oop.serialization

This is an interesting thing with classes when B extends A, then private variable of class A will not be serialized when using magic method __sleep(). Without __sleep() it works fine. class A { public $a1 = 'a1'; protected $a2 = 'a2'; private $a3 = 'a3'; public function __sleep() { // option 1: wont work, says: // Notice: serialize() [function.serialize]: "a3" returned as member variable from __sleep() but does not exist in **/index.php on line ** return $this; // option 2: wont work, says: // Notice: serialize() [function.serialize]: "a3" returned as member variable from __sleep() but does not exist in **/index.php on line ** $keys = array(); foreach( $this as $key => $value) $keys[] = $key; return $vals; } } class B extends A { public $b1 = 'b1'; public $b2 = 'b2'; public $b3 = 'b3'; } print_r(unserialize(serialize(new B()))); Not sure if this is bug or feature. ---- Server IP: 194.145.210.3 Probable Submitter: 88.196.45.130 ---- Manual Page -- http://www.php.net/manual/en/language.oop.serialization.php Edit -- https://master.php.net/note/edit/80173 Del: integrated -- https://master.php.net/note/delete/80173/integrated Del: useless -- https://master.php.net/note/delete/80173/useless Del: bad code -- https://master.php.net/note/delete/80173/bad+code Del: spam -- https://master.php.net/note/delete/80173/spam Del: non-english -- https://master.php.net/note/delete/80173/non-english Del: in docs -- https://master.php.net/note/delete/80173/in+docs Del: other reasons-- https://master.php.net/note/delete/80173 Reject -- https://master.php.net/note/reject/80173 Search -- https://master.php.net/manage/user-notes.php