PHP interface Keyword
Example
Create and 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 interface keyword is used to create interfaces.
An interface is a structure which defines a list of methods that must exist in a class.
Interfaces are a good way to allow many different classes to be used in the same way.
The implements keyword can be used to make a class use an interface.
Related Pages
The implements keyword
❮ PHP Keywords
