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

);

希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。