<?php class MyParent { private $var = 0; } class Child extends MyParent { public function __construct() { $this->var = 1; } } class Abuser extends MyParent { public function get(MyParent $child) { return $child->var; } } $child = new Child(); $abuser = new Abuser(); var_dump($abuser->get($child)); //var_dump($child); //var_dump($abuser);
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