PHP program to inherit an abstract class into multiple non-abstract classes

<?php
//PHP program to inherit an abstract class into 
//multiple non-abstract classes.
abstract class AbsClass
{
    public abstract function fun();
}

class Sample1 extends AbsClass
{
    public function fun()
    {
        printf("Sample1::fun() called<br>");
    }
}

class Sample2 extends AbsClass
{
    public function fun()
    {
        printf("Sample2::fun() called<br>");
    }
}

class Sample3 extends AbsClass
{
    public function fun()
    {
        printf("Sample3::fun() called<br>");
    }
}

$obj1 = new Sample1();
$obj2 = new Sample2();
$obj3 = new Sample3();

$obj1->fun();
$obj2->fun();
$obj3->fun();
?>

Output
Sample1::fun() called
Sample2::fun() called
Sample3::fun() called