在codeigniter中将多个文件添加到单个列

// 文件上传控制器
class UploadController extends CI_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->library('upload');
        $this->load->database();
    }

    public function upload() {
        // 文件上传配置
        $config['upload_path'] = './uploads/';
        $config['allowed_types'] = 'gif|jpg|png';
        $config['max_size'] = 1024;

        $this->upload->initialize($config);

        if (!$this->upload->do_upload('file')) {
            // 文件上传失败
            $error = $this->upload->display_errors();
            echo $error;
        } else {
            // 文件上传成功
            $data = $this->upload->data();

            // 将文件信息保存到数据库
            $fileData = array(
                'filename' => $data['file_name'],
                'filepath' => $data['full_path']
            );
            $this->db->insert('files', $fileData);

            echo '文件上传成功！';
        }
    }
}