PHP implements Keyword

Example

Implement an interface:

<?php
interface Machine {
public function activate();
public function deactivate();
public function isActive();
}

class Kettle implements Machine {
private $isOn = false;

public function activate() {
    $this->isOn = true;
}

public function deactivate() {
    $this->isOn = false;
}

public function isActive() {
    return $this->isOn;
}
}

$machine = new Kettle();

$machine->activate();
if($machine->isActive()) {
echo "The machine is on";
} else {
echo "The machine is off";
}

echo "<br>";
$machine->deactivate();
if($machine->isActive()) {
echo "The machine is on";
} else {
echo "The machine is off";
}
?>

Try it Yourself »

Definition and Usage

The implements keyword is used to declare that a class must have the methods described in the specified interface. This is called polymorphism. Polymorphism makes it easy to use a variety of different objects in the same way.

The interface keyword

The else keyword

Read more about objects, classes and interfaces in our PHP OOP Tutorial.

❮ PHP Keywords

PHP implements Keyword

Example

Definition and Usage

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