php batch upload implementation code

  if (isset($_POST['submit'])) {
   foreach($_FILES['product_img']['error'] as $k=>$v){
    if ($v == UPLOAD_ERR_OK) {
     $sql ='product_img'.($k+1);
     $tmp_name = $_FILES['product_img']['tmp_name'][$k];
     $file_name = $_FILES['product_img']['name'][$k];
     $file_type = $_FILES['product_img']['type'][$k];
     $upload_name = getPath('../Public/Upload').time().'_'.$file_name;
     @move_uploaded_file($tmp_name,$upload_name);
     $map[$sql] = $file_name;
     print_r($map);
     exit;
    }
   }
  }