为什么我echo出来的东西就是一个%s？而不是我赋值的字符串?

完整代码：
IndexAction.class.php

responseMsg();
    }
    public function responseMsg(){
        $postStr="
                 
                 
                 1348831860
                 
                 
                 1234567890123456
                 ";
        $postObj = simplexml_load_string($postStr);
        $fromUsername = $postObj->FromUserName;
        //echo $fromUsername;
        //echo '111';
        $toUsername = $postObj->ToUserName;
        $time = time();
        $msgType = $postObj->MsgType;
        $content = $postObj->Content;
        if($content=='tel'){
            $indexModel=new IndexModel();
            $indexModel->responseText($postObj,$content);
        }
    }
}

IndexModel.class.php

FromUserName;
            $toUsername = $postObj->ToUserName;
            $textTpl = "
                        
                        
                        %s
                        
                        
                        "; 
            echo  "textTpl is: ".$textTpl;
            $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $content); 
              //  echo $resultStr; 
        }
        
    }
?>