php: 不能嵌套try-catch-fnally,否則執行時間過長

php不能try-catch-fnally里面在嵌套try-catch-fnall，否則本來執行時間不長的程序，會被執行更長時間，這是php的bug嗎？

如：

      try{
          代碼塊
        }catch (\Exception $e)
        {
            echo get_class($e), ": ", $e->getMessage(), "\n";
            echo " File=", $e->getFile(), "\n";
            echo " Line=", $e->getLine(), "\n";
            echo $e->getTraceAsString();
        }finally{
           try{
             代碼塊
           }catch (\Exception $e)
           {
            echo get_class($e), ": ", $e->getMessage(), "\n";
            echo " File=", $e->getFile(), "\n";
            echo " Line=", $e->getLine(), "\n";
            echo $e->getTraceAsString();
           }finally{
              代碼塊
           }
        }

　　應該改成：

         try{
             代碼塊
           }catch (\Exception $e)
           {
            echo get_class($e), ": ", $e->getMessage(), "\n";
            echo " File=", $e->getFile(), "\n";
            echo " Line=", $e->getLine(), "\n";
            echo $e->getTraceAsString();
           }finally{
              代碼塊
           }

            try{
             代碼塊
           }catch (\Exception $e)
           {
            echo get_class($e), ": ", $e->getMessage(), "\n";
            echo " File=", $e->getFile(), "\n";
            echo " Line=", $e->getLine(), "\n";
            echo $e->getTraceAsString();
           }finally{
              代碼塊
           }