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<?php abstract class A { private $x; final public function __sleep() { return array_keys(get_object_vars($this)); } } class B extends A {} var_dump(serialize(new B));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: serialize(): "x" returned as member variable from __sleep() but does not exist in /in/mTZpa on line 12 string(12) "O:1:"B":0:{}"

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