//列表页banner图片
public function edit_list_page_banner($category_id=\"\"){
  $category_id= empty($category_id)?$_POST[\"category_id\"]:$category_id;
  //上传图片
  if(isset($_POST[\"key\"]) && $_POST[\"key\"] == \"upload\"){
   /*
   1.set_upload_path
   */
   $config[\'upload_path\']=\"./upload/source/\".date(\"Y/m/d\");//文件上传目录
   if(!file_exists(\"./upload/source/\".date(\"Y/m/d\"))){
    mkdir(\"./upload/source/\".date(\"Y/m/d\"),0777,true);//原图路径
   }
   if(!file_exists(\"./upload/big_thumb/\".date(\"Y/m/d\"))){
    mkdir(\"./upload/big_thumb/\".date(\"Y/m/d\"),0777,true);//大缩略图路径
   }
   if(!file_exists(\"./upload/small_thumb/\".date(\"Y/m/d\"))){
    mkdir(\"./upload/small_thumb/\".date(\"Y/m/d\"),0777,true);//小缩略图路径
   }
   $config[\'allowed_types\']=\"gif|jpg|png|txt\";//文件类型
   $config[\'max_size\']=\"20000\";//最大上传大小
   $this->load->library(\"upload\",$config);
   if($this->upload->do_upload(\'userfile\'))//表单中name=\"userfile\"
   {
    //上传成功之后，生成两张缩略图
    $data=$this->upload->data();//返回上传图片的信息
    $this->load->library(\"image_lib\");//载入图像处理类库
    //第一种方式：大缩略图的配置参数
    /*
    $config_big_thumb[\'image_library\'] = \'gd2\';//gd2图库
    $config_big_thumb[\'source_image\'] = $data[\'full_path\'];//原图
    $config_big_thumb[\'new_image\'] = \"./upload/big_thumb/\".date(\"Y/m/d\").\"/\".$data[\'file_name\'];//大缩略图
    $config_big_thumb[\'create_thumb\'] = true;//是否创建缩略图
    $config_big_thumb[\'maintain_ratio\'] = true;
    $config_big_thumb[\'width\'] = 300;//缩略图宽度
    $config_big_thumb[\'height\'] = 300;//缩略图的高度
    $config_big_thumb[\'thumb_marker\']=\"_300_300\";//缩略图名字后加上 \"_300_300\",可以代表是一个300*300的缩略图
    */
    //第二种：大缩略图的配置参数
    /*
    $config_big_thumb=array(
     \'image_library\' => \'gd2\',//gd2图库
     \'source_image\' => $data[\'full_path\'],//原图
     \'new_image\' => \"./upload/big_thumb/\".date(\"Y/m/d\").\"/\".$data[\'file_name\'],//大缩略图
     \'create_thumb\' => true,//是否创建缩略图
     \'maintain_ratio\' => true,
     \'width\' => 300,//缩略图宽度
     \'height\' => 300,//缩略图的高度
     \'thumb_marker\'=>\"_300_300\"//缩略图名字后加上 \"_300_300\",可以代表是一个300*300的缩略图
    );
    */
    //第三种方式：将部分配置信息放到了config.php文件中
    $config_big_thumb=$this->config->item(\"config_big_thumb\");
    $config_big_thumb[\'source_image\']=$data[\'full_path\'];
    $config_big_thumb[\'new_image\']=\"./upload/big_thumb/\".date(\"Y/m/d\").\"/\".$data[\'file_name\'];
    //小缩略图的配置参数
    /*
    $config_small_thumb[\'image_library\'] = \'gd2\';//gd2图库
    $config_small_thumb[\'source_image\'] = $data[\'full_path\'];//原图
    $config_small_thumb[\'new_image\'] = \"./upload/small_thumb/\".date(\"Y/m/d\").\"/\".$data[\'file_name\'];//大缩略图
    $config_small_thumb[\'create_thumb\'] = true;//是否创建缩略图
    $config_small_thumb[\'maintain_ratio\'] = true;
    $config_small_thumb[\'width\'] = 100;//缩略图宽度
    $config_small_thumb[\'height\'] = 100;//缩略图的高度
    $config_small_thumb[\'thumb_marker\']=\"_100_100\";//缩略图名字后加上 \"_100_100\",可以代表是一个100*100的缩略图
    */
    //小缩略图的配置参数
    $config_small_thumb=array(
     \'image_library\' => \'gd2\',//gd2图库
     \'source_image\' => $data[\'full_path\'],//原图
     \'new_image\' => \"./upload/small_thumb/\".date(\"Y/m/d\").\"/\".$data[\'file_name\'],//大缩略图
     \'create_thumb\' => true,//是否创建缩略图
     \'maintain_ratio\' => true,
     \'width\' => 100,//缩略图宽度
     \'height\' => 100,//缩略图的高度
     \'thumb_marker\'=>\"_100_100\"//缩略图名字后加上 \"_300_300\",可以代表是一个300*300的缩略图
    );
    //$this->load->library(\"image_lib\",$config_thumb);
    $this->image_lib->initialize($config_big_thumb);
    $this->image_lib->resize();//生成big缩略图
    $this->image_lib->initialize($config_small_thumb);
    $this->image_lib->resize();//生成small缩略图
    //插入数据库
    $data_array = array(
     \'category_id\' => $category_id,
     \'pic_url\' => \"./upload/source/\".date(\"Y/m/d\").\"/\".$data[\'file_name\'],
     \'addtime\' => time(),
     \'is_stop\' => 1,
     \'sort\'=>0,
     \'gender\' => $_POST[\"gender\"],
     \'link_url\'=>$_POST[\"link_url\"],
     \'user_id\' => intval($this->cur_user [\'user_id\'])
    );
    $this->category_model->add_category_banner($data_array);
   }
  }
  $con_arr[] = \" category_id= \'{$category_id}\'\";
  if ($gender==\'\' ) {
   $gender=0;
  }
  $con_arr[] = \" gender= \'{$gender}\'\";
  $condition = implode( \' and \', $con_arr);
  $banner_list = $this->category_model->get_banner_all($condition);
  $this->tp->assign(\'banner_list\', $banner_list);
  $this->tp->assign(\'base_url\', base_url());
  $this->tp->assign(\'gender\', $gender);
  $this->tp->assign(\'category_id\', $category_id);
  $this->tp->display(\"category/edit_list_page_banner.php\");
}

//大缩略图的配置参数
$config_big_thumb=array(
 \'image_library\' => \'gd2\',//gd2图库
 \'create_thumb\' => true,//是否创建缩略图
 \'maintain_ratio\' => true,
 \'width\' => 300,//缩略图宽度
 \'height\' => 300,//缩略图的高度
 \'thumb_marker\'=>\"_300_300\"//缩略图名字后加上 \"_300_300\",可以代表是一个300*300的缩略图
);