thinkphp中一个方法调用另一个步骤的变量

//实例化上传类<br />     public function upload() {       <br />        $upload = new Upload();<br />        $upload->maxSize = 10 * 1024 * 1024;<br />        $upload->exts = array('jpg', 'jpeg', 'gif', 'txt','zip');<br />        $upload->savePath = './';<br />        $upload->hash = false;<br />        $info = $upload->upload();<br />        if (!$info) {<br />            $this->error($upload->getError());<br />        } <br />        else{<br />            foreach ($info as $file) {<br />                $uploadFile=$file['savepath'].$file['savename'];<br />                echo $uploadFile;<br />            }          <br />        }<br />    }<br />    //添加文章<br />    public function addArticle(){<br />    	 $sort = $_POST['sort'];<br />    	 $title = $_POST['title'];<br />    	 $intro = $_POST['intro'];<br />    	 $pic = $_POST['pic'];<br />    	 $content = $_POST['content'];   <br />    	 $articleSort= D('Article')->addArticle($sort,$title,$intro,$pic,$content);<br />         $this->display('Index/AddArticle');<br />    }