【ci框架】ci框架中文件上传类及图像处理类的应用

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//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'] = 1
4000
00;//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");  
    }  

config.PHP文件中有关缩略图的配置项：

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//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  
);