Two examples of writing Codeigniter file batch upload controller

Example 1:

/**
 *  Multiple file upload 
 * 
 * @author Dream <dream@shanjing-inc.com>
 */
public function multiple_uploads() {
  // Load the required class library 
  $this->load->library('upload');
  
  // Configure upload parameters 
  $upload_config = array(
      'upload_path'  => '',
      'allowed_types' => 'jpg|png|gif',
      'max_size'   => '500',
      'max_width'   => '1024',
      'max_height'  => '768',
  );
  $this->upload->initialize($upload_config);
    
  // Loop through uploaded files 
  foreach ($_FILES as $key => $value) {
    if (!empty($key['name'])) {
      if ($this->upload->do_upload($key)) {
        // Upload succeeded 
        print_r($this->upload->data());
      } else {
        // Upload failed 
        echo $this->upload->display_errors();
      }
    }
  }
}

Example 2:

function upload() {
    $config['upload_path'] = './uploads/'; 
    /* Here's uploads Is relative to index.php Adj. , That is, the entry file , Don't make a mistake about this !
     Otherwise, an error will be reported "The upload path does not appear to be valid."; 
    */
    $config['allowed_types'] = 'gif|jpg|png';
    /* I try to upload other types of files , Here 1 Be sure to pay attention to the order ! 
    A problem was encountered while attempting to move the uploaded file to the final destination.
     This error 1 Generally, the file name of the uploaded file cannot be a Chinese name , This is very depressing ! Not yet resolved , You can use other methods , Re-alter 1 The file name can be solved ! 
    $config['allowed_types'] = 'zip|gz|png|gif|jpg';( Correct )
    $config['allowed_types'] = 'png|gif|jpg|zip|gz';( Errors )
    */
    $config['max_size'] = '1024';
    $config['max_width'] = '1024';
    $config['max_height'] = '768';

    $config['file_name'] = time(); // File name does not use original name 
    $this->load->library('upload', $config);
    if(!$this->upload->do_upload()) {
        echo $this->upload->display_errors();
    }else{

       $data['upload_data']=$this->upload->data(); // Documentary 1 Some information 
       $img=$data['upload_data']['file_name']; // Get the file name 

       echo $img."<br>";

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

      }

    }
}