PHP 匿名类

<?php 
interface Logger { 
   public function log(string $msg,NULL); 
} 
 
class Application { 
   private $logger; 
 
   public function getLogger(): Logger { 
      return $this->logger; 
   } 
 
   public function setLogger(Logger $logger) { 
      $this->logger = $logger; 
   }   
} 
 
$app = new Application; 
// 使用 new class 创建匿名类 
$app->setLogger(new class implements Logger { 
   public function log(string $msg) { 
      print($msg,NULL); 
   } 
},NULL); 
 
$app->getLogger()->log("我的第一条日志",NULL); 
?>