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<?php class MyClass { private $privateProperty; public function setPrivateProperty($prop) { $this->privateProperty = $prop; return $this; } public function evaluate(MyClass1 $object) { // this does not work var_dump($object->privateProperty); } } class MyClass1 { private $privateProperty; public function setPrivateProperty($prop) { $this->privateProperty = $prop; return $this; } } $obj1 = (new MyClass)->setPrivateProperty('foo'); $obj2 = (new MyClass1)->setPrivateProperty('bar'); $obj1->evaluate($obj2);

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