INTERFACES in PHP

INTERFACES in PHP

An interface is a description of the actions that an object can do. Interface is written in the same way as the class the declaration with interface keyword.

Rules of Interfaces:

1. All methods declared in an interface must be public; this is the nature of an interface.
2. All methods in the interface must be implemented within a class; failure to do so will result in a fatal error.
3. The class implementing the interface must use the exact same method signatures as are defined in the interface Interfaces can be extended like classes using the extends operator.

Eg:- <?php
interface A {
    public function setProperty($x);
    public function description();
}
class Mangoes implements A {
   public function setProperty($x) {
        $this->x = $x;
    }
    public function description() {
        echo 'Describing' . $this->x . tree;
  }
}
$Mango = new Mangoes();
$Mango->setProperty(mango);
$Mango->description();
?>
Output:
Describing Mango tree

Interface can be extended with another interface using extends keyword:-
Eg:- <?php
interface A {
    public function Compute();
}
interface B extends A {
    public function Divide();
}
class C implements B {
    public function Divide() {
    $var=10;
    $var1=2;
    $var3=$var/$var1;
    echo “division of 10/2 is” . $var3;
}
    public function Compute() {
        $a=2;
        $b=3;
        $c=$a*$b;
        echo “multiplication of 2*3 is” . $c;
    }
}
$obj = new C();
$obj->Divide();
$obj->Compute();
?>
Output:
division of 10/2 is 5
multiplication of 2*3 is 6

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