Inheritance in PHP OOPS

<?php

class TV
{
    public $model;
    public $volume;

    public function volumeUp()
    {
        $this->volume++;
    }
   
    public function volumeDown()
    {
        $this->volume--;
    }
   
    //Here Below constructor(of class TV) will be override because there is also a
    // constructor(of class TvWithTimer) present inside TvWithTimer Class as shown below :
    public function __construct($m, $n)
    {
        $this->model = $m;
        $this->volume = $n;
    }
}

class TvWithTimer extends TV
{
    public $timer = true;

    public function __construct($a, $b)
    {
        echo "Hello $a, this is TvWithTimer class constructor and value is $b";
    }
}

class plazmaTv extends TV
{
    public $plazmaVar = true;
    public $plazmaVarTwo = false;
    public $model = "def";
}

$tv = new TvWithTimer("abc", 2);
$plazma = new plazmaTv("plazma Tv", 3);

//Here below the value of "model" variable will be override
//because First "model" value is "def" in plazmaTv class and
//second "model" value is "Hello" as shown below :
$plazma->model = "Hello";
echo $plazma->model . "<br>";

echo $tv->model . "<br>";
echo $tv->volume . "<br>";

echo $plazma->model . "<br>";
echo $plazma->volume . "<br>";

echo $plazma->plazmaVar . "<br>";
echo $plazma->plazmaVarTwo . "<br>";

// OUTPUT :
//Hello abc, this is TvWithTimer class constructor and value is 2Hello


// Hello
// 3
// 1

?>

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