Usage analysis of CI framework file upload class and image processing class, ci file upload_PHP tutorial

Usage analysis of CI framework file upload class and image processing class, ci file upload

This article describes the usage of CI framework file upload class and image processing class with examples. Share it with everyone for your reference, the details are as follows:

//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");
}

Configuration items related to thumbnails in the config.php file:

//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
);

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