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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> <!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_keyword_implements by HTTrack Website Copier/3.x [XR&CO'2014], Tue, 07 Jun 2022 20:30:04 GMT --> </html>
The machine is on
The machine is off