How to use the CI framework to optimize file uploads and upload multiple files

<?php
  defined(&#39;BASEPATH&#39;) OR exit(&#39;No direct script access allowed&#39;);
  //上传的参数配置
  $config[&#39;upload_path&#39;] = &#39;./public/uploads/&#39;;
  $config[&#39;allowed_types&#39;] = &#39;gif|png|jpg&#39;;
  $config[&#39;max_size&#39;] = 100;
  $config[&#39;max_width&#39;] = &#39;1024&#39;;
  $config[&#39;max_height&#39;] = &#39;768&#39;;

<?php
defined(&#39;BASEPATH&#39;) OR exit(&#39;No direct script access allowed&#39;);
/**
 * 控制器
 */
class Brand extends Admin_Controller
{
  public function __construct()
  {
    parent::__construct();
    $this->load->model(&#39;brand_model&#39;);
    $this->load->library(&#39;form_validation&#39;);
    //激活分析器以调试程序
    $this->output->enable_profiler(TRUE);
    //配置中上传的相关参数会自动加载
    $this->load->library(&#39;upload&#39;);
  }
}

public function insert()
{
  //设置验证规则
  $this->form_validation->set_rules('brand_name','名称','required');
  if($this->form_validation->run() == false){
    //未通过验证
    $data['message'] = validation_errors();
    $data['wait'] = 3;
    $data['url'] = site_url('admin/brand/add');
    $this->load->view('message.html',$data);
  }else{
    //通过验证，处理图片上传
    if ($this->upload->do_upload('logo')) { //logo为前端file控件名
      //上传成功，获取文件名
      $fileInfo = $this->upload->data();
      $data['logo'] = $fileInfo['file_name'];
      //获取表单提交数据
      $data['brand_name'] = $this->input->post('brand_name');
      $data['url'] = $this->input->post('url');
      $data['brand_desc'] = $this->input->post('brand_desc');
      $data['sort_order'] = $this->input->post('sort_order');
      $data['is_show'] = $this->input->post('is_show');
      //调用模型完成添加动作
      if($this->brand_model->add_brand($data)){
        $data['message'] = "添加成功";
        $data['wait'] = 3;
        $data['url'] = site_url('admin/brand/index');
        $this->load->view('message.html',$data);
      }else{
        $data['message'] = "添加失败";
        $data['wait'] = 3;
        $data['url'] = site_url('admin/brand/add');
        $this->load->view('message.html',$data);
      }
    }else{
      //上传失败
      $data['message'] = $this->upload->display_errors();
      $data['wait'] = 3;
      $data['url'] = site_url('admin/brand/add');
      $this->load->view('message.html',$data);
    }
  }
}

/**
 * Codeigniter框架实现多文件上传
 * @author Zhihua_W
 * 方法一：对上传的文件进行循环处理
 */
public function multiple_uploads1()
{
  //载入所需文件上传类库
  $this->load->library('upload');
  //配置上传参数
  $upload_config = array(
    'upload_path' => './public/uploads/',
    'allowed_types' => 'jpg|png|gif',
    'max_size' => '500',
    'max_width' => '1024',
    'max_height' => '768',
  );
  $this->upload->initialize($upload_config);
  //循环处理上传文件
  foreach ($_FILES as $key => $value) {
    if (!empty($key['name'])) {
      if ($this->upload->do_upload($key)) {
        //上传成功
        print_r($this->upload->data());
      } else {
        //上传失败
        echo $this->upload->display_errors();
      }
    }
  }
}

/**
 * Codeigniter框架实现多文件上传
 * @author Zhihua_W
 * 方法二：直接一下将多个文件全部上传然后在对上传过的数据进行处理
 */
public function multiple_uploads2()
{
  $config['upload_path'] = './public/uploads/';
  //这里的public是相对于index.php的,也就是入口文件,这个千万不能弄错!
  //否则就会报错："The upload path does not appear to be valid.";
  $config['allowed_types'] = 'gif|jpg|png';
  //我试着去上传其它类型的文件,这里一定要注意顺序!
  //否则报错："A problem was encountered while attempting to move the uploaded file to the final destination."
  //这个错误一般是上传文件的文件名不能是中文名,这个很郁闷!还未解决,大家可以用其它方法,重新改一下文件名就可以解决了!
  //$config['allowed_types'] = 'zip|gz|png|gif|jpg';(正确)
  //$config['allowed_types'] = 'png|gif|jpg|zip|gz';(错误)
  $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(); //上传文件的一些信息
    $img = $data['upload_data']['file_name']; //取得文件名
    echo $img . "<br>";
    foreach ($data[&#39;upload_data&#39;] as $item => $value) {
      echo $item . ":" . $value . "<br>";
    }
  }
}