How can it possible that a private propery is access in child class

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PHP

encapsulation

modifiers

sir when we un-comment the getModel method in child class and execute it dispaly error private property can not access in child but in get_Display method same propety is access how is it possible or i m making a mistake?

class Tv{
public $volume;
private $model;

function volume_up(){
$this->volume++;
}


function __construct($m,$v){
$this->model=$m;
$this->volume=$v;
}

function getModel(){
return $this->model;

}

}





$obj=new Tv('xyz',10);
//$obj->model;//error can not access private property

echo $obj->getModel();// can access private property


class Plazma extends Tv {
/*function getModel(){
return $this->model;

}*/


function get_Display( ){
return $this->model='AXN';

}


}

$obj2=new Plazma('xyz',10);
//$obj->model;//error can not access private property

// $obj2->getModel();// can access private property
echo $obj2->get_Display('ANX');
?>

What I have tried:


class Tv{
public $volume;
private $model;

function volume_up(){
$this->volume++;
}


function __construct($m,$v){
$this->model=$m;
$this->volume=$v;
}

function getModel(){
return $this->model;

}

}





$obj=new Tv('xyz',10);
//$obj->model;//error can not access private property

echo $obj->getModel();// can access private property


class Plazma extends Tv {
/*function getModel(){
return $this->model;

}*/


function get_Display( ){
return $this->model='AXN';

}


}

$obj2=new Plazma('xyz',10);
//$obj->model;//error can not access private property

// $obj2->getModel();// can not access private property
echo $obj2->get_Display('ANX'); // but here private property is access why ?
?>