在这里我的控制器文件这工作正常，除了在拇指文件夹名称得到更改为converted_thumb的例子：我原来的图像名称是converted.jpg，但在拇指文件夹中，它保存为converted_thumb，所以我想从图像名称中删除_thumb，请解决这个问题

public function do_upload() {
$config['upload_path'] = './uploads';  //  uploaded file store here
        $config['allowed_types'] = 'jpg|png|jpeg|gif';
        $config['max_size'] = ' 2097152';
        $this->load->library('upload', $config);
        if ($this->upload->do_upload()) {

            $data = $this->upload->data();

            //create  copy of image

            $configs['image_library'] = 'gd2';
            $configs['source_image'] = $data['full_path'];
            $configs['new_image'] = 'uploads/thumbs/'; //resize image will save here
            $configs['create_thumb'] = 'false';
            $configs['width'] = '250';
            $configs['height'] = '250';
            $this->load->library('image_lib', $configs);
            $this->image_lib->resize();

            $image_name = $data['file_name'];
            //$full_path = $data['full_path'];
            $post = array(
                'product_name' => $image_name,
                'product_path' => $configs['new_image'].$image_name
            );

            $this->db->insert('project', $post);
        } else {
            echo $this->upload->display_errors();
        }
    }

}