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<!DOCTYPE html>
<html>
<body>
​
<?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";
}
?>
​
</body>
​
The machine is on
The machine is off