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<?php class A { private $a = 'This is $a from A'; public $b = 'This is $b from A'; public function __sleep(): array { var_dump(array_keys(get_object_vars($this))); return []; } } class B extends A { public $a = 'This is $a from B'; } $b = new B; serialize($b);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(1) "a" [1]=> string(1) "b" }

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