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<?php
interface Logger {
   public function log(string $msg);
}

class Application {
   private $logger;

   public function getLogger(): Logger {
      return $this->logger;
   }

   public function setLogger(Logger $logger) {
      $this->logger = $logger;
   }  
}

$app = new Application;
// Using new class to create an anonymous class
$app->setLogger(new class implements Logger {
   public function log(string $msg) {
      print($msg);
   }
});

$app->getLogger()->log("My first log");
?>

My first log