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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;}} echo serialize((new b)->setA(new a));
Output for git.master, git.master_jit, rfc.property-hooks
O:1:"b":1:{s:4:"*b";O:1:"a":2:{s:4:"*a";i:10;s:4:"*c";N;}}

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