PHP program to implement an interface into multiple classes

Here, we are going to learn how to implement an interface into multiple classes in PHP?
Submitted by Nidhi, on November 20, 2020 [Last updated : March 13, 2023]

Implementing Interface into Multiple Classes

Here, we will create an interface that contains the declaration of functions and then we will implement the interface into multiple classes with function definitions.

PHP code to implement an interface into multiple classes

The source code to implement an interface into multiple classes is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

<?php
//PHP program to implement an interface 
//into multiple classes.
interface Inf
{
    public function fun();
}

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

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

class Sample3 implements Inf
{
    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

Explanation

In the above program, we created an interface Inf that contains the declaration of function fun().

After that, we created three classes Sample1, Sample2, and Sample3. Here, we used the implements keyword to implement an interface into the class.  Then we implemented the same interface in all three classes.

At last, we created three objects $obj1, $obj2, and $obj3, and called functions that will print the appropriate message on the webpage.

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