PHP program to implement multiple interfaces in the same class

In the following example of PHP program that demonstrates how to implement multiple interfaces in the same class :

Program :

<?php

interface Greeting {
    public function sayHello();
}

interface Departure {
    public function sayGoodbye();
}

class MyClass implements Greeting, Departure {
    public function sayHello() {
        echo "Hello, world!\n";
    }

    public function sayGoodbye() {
        echo "Goodbye, world!\n";
    }
}

$obj = new MyClass();
$obj->sayHello();
$obj->sayGoodbye();

?>

Output :

Hello, world!
Goodbye, world!

In this example, we have two interfaces `Greeting` and `Departure`, each with one method. We then define a class `MyClass` that implements both of these interfaces and defines the methods required by each.

Finally, we create an object of `MyClass` and call its methods to output "Hello, world!" and "Goodbye, world!".