走投无路啦，关于表单的两步提交传递数组的有关问题

<?php<br />
 session_start();<br />
 require_once('pic_fns.php');<br />
 include("upload.class.php");<br />
<br />
<br />
 $edit_me = $_POST['edit_me'];                    //checkbox选中的数据储存在 edit_me数组中<br />
 $valid_user = $_SESSION['valid_user'];          //检测是否登录<br />
<br />
 do_html_header("上传图片广告 Upload pic for machine");  <br />
   try{<br />
 	   check_valid_user();                            //检测是否登录<br />
   }catch(Exception $e){<br />
       echo $e->getMessage();<br />
 	   do_html_url('login_admin.php','返回');<br />
 	   do_html_footer();<br />
 	   exit;<br />
   }<br />
   <br />
 foreach ($edit_me as $k){                        //循环上传图片，提交后显示WARNING foreach的数据为空<br />
<br />
      if($_POST['submit']){                      //图片上传部分<br />
          $image = new upload_image();<br />
          $image->get_file_dir("pic/".$k."/");   //文件存放目录<br />
          $image->get_upload_name($_FILES['file']['name']);<br />
          $image->get_upload_size($_FILES['file']['size']);<br />
          $image->get_upload_type($_FILES['file']['type']);<br />
          $image->get_upload_tamp($_FILES['file']['tmp_name']);<br />
<br />
          $image->upload();<br />
           display_user_menu();<br />
           do_html_footer;<br />
      }<br />
   }<br />
<br />
  ?><br />
  <form action="" method="post" enctype="multipart/form-data"><br />
    <table align="center"><br />
       图片来源：<input type="file" name="file"><br />
           <input type="hidden" name="hidden" value="a"><br />
                <input type="submit" name="submit" value="上传"><br />
    </table><br />
  </form><br /><br />
<br />
  <?php<br />
<br />
 display_user_menu();                <br />
 do_html_footer;<br />
<br />
?>