CodeIgniter上传图片成功的全部过程分享

最近几天正在做一个小型CMS,用到图片上传了,想利于CodeIgniter的上传类去实现,但测试中有好多问题,我把经过和要注意的地方分享一下!
复制代码 代码如下:

controller代码:
 function upload() {
        $config['upload_path'] = './uploads/';
       
        $config['allowed_types'] = 'gif|jpg|png';
       
        $config['max_size'] = '1024';
        $config['max_width']  = '1024';
        $config['max_height']  = '768';

        $config['file_name']  = time(); //文件名不使用原始名
        $this->load->library('upload', $config);
        if(!$this->upload->do_upload()) {
                echo $this->upload->display_errors();
        }else{

             $data['upload_data']=$this->upload->data();  //文件的一些信息
             $img=$data['upload_data']['file_name'];  //取得文件名

             echo $img."
";

             foreach($data['upload_data'] as $item => $value){
             echo $item.":".$value."
";

            }

       }
}