PHP新特性之匿名类详解

<?phpinterface 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;$app->setLogger(new class implements Logger {
    public function log(string $msg) {
        echo $msg;
    }
});

var_dump($app->getLogger());?>

object(class@anonymous)#2 (0) {}