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<?php class a { protected $a = 10; protected $c;} class b { protected $b; public function setA($a){$this->b = $a;return $this;}} var_dump(unserialize(serialize((new b)->setA(new a)), [true]));
Output for git.master, git.master_jit, rfc.property-hooks
object(b)#1 (1) { ["b":protected]=> object(a)#2 (2) { ["a":protected]=> int(10) ["c":protected]=> NULL } }

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