PHP匿名类

现在可以使用新类定义匿名类，可以使用匿名类代替完整的类定义。

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

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

My first Log Message