In Multilevel inheritance class inherits from another class, and that class also inherits from another class.

Inheritance happens in multiple levels

Example:

<?php
class Person {
   public function showName(){
      echo "Name: Rahul <br>";
   }
}
class Student extends Person {
   public function showCourse(){
      echo "Course: BCA <br>";
   }
}
class Result extends Student {
   public function showResult(){
      echo "Result: Pass";
   }
}
$obj = new Result();
$obj->showName();    // from Person
$obj->showCourse();  // from Student
$obj->showResult();  // from Result
?>

• Person - Parent class
• Student - Child class (inherits Person)
• Result - Grandchild class (inherits Student)