CI框架文件上传类及图像处理类用法分析

本文实例讲述了CI框架文件上传类及图像处理类用法。分享给大家供大家参考，具体如下：/

本文实例讲述了CI框架文件上传类及图像处理类用法。分享给大家供大家参考，具体如下：

//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");
}

config.php文件中有关缩略图的配置项：

//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
);