Here is the example code of multilevel inheritance in PHP

​

class Animal { 

    public $name; 

    public $species; 

    function __construct($name, $species) { 

        $this->name = $name; 

        $this->species = $species; 

    } 

    function eat() { 

        echo $this->name . " is eating<br>"; 

    } 

    function sleep() { 

        echo $this->name . " is sleeping<br>"; 

    } 

} 

class Mammal extends Animal { 

    function nurse() { 

        echo $this->name . " is nursing<br>"; 

    } 

} 

class Reptile extends Animal { 

    function sunbathe() { 

        echo $this->name . " is sunbathing<br>"; 

    } 

} 

class Dog extends Mammal { 

    function bark() { 

        echo $this->name . " is barking<br>"; 

    } 

} 

class Snake extends Reptile { 

    function hiss() { 

        echo $this->name . " is hissing<br>"; 

    } 

}

​

I Hope it will Help you. Thank You.

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For more refer link: https://programming-quest.blogspot.com/2023/03/multilevel-inheritance-in-php-tips.html