如何在CodeIgniter中上传图片？

问题描述

查看

 <？php echo form_open_multipart（'welcome / do_upload'）;？> 
< input type =filename =userfilesize =20/> 
  

在控制器中

 code> function do_upload（）
 {
 $ config ['upload_path'] ='./uploads/'; 
 $ config ['allowed_types'] ='gif | jpg | png'; 
 $ config ['max_size'] ='100'; 
 $ config ['max_width'] ='1024'; 
 $ config ['max_height'] ='768'; 
 $ config ['overwrite'] = TRUE; 
 $ config ['encrypt_name'] = FALSE; 
 $ config ['remove_spaces'] = TRUE; 
 if（！is_dir（$ config ['upload_path']））die（THE UPLOAD DIRECTORY DOES NOT EXIST）; 
 $ this-> load-> library（'upload'，$ config）; 
 if（！$ this-> upload-> do_upload（'userfile'））{
 echo'error'; 
} else {
 
 return array（'upload_data'=> $ this-> upload-> data（））; 
} 
} 
  

我这样调用这个函数

  $ this-> data ['data'] = $ this-> do_upload 
  

并查看此图片：

 < ul> 
<？php foreach（$ data ['upload_data'] as $ item => $ value）：？> 
< li><？php echo $ item;？> ;:<？php echo $ value;？>< / li> 
<？php endforeach; > 
< / ul> 
  

我不知道错误是什么。

解决方案

似乎问题是你发送表单请求到 welcome / do_upload ，并调用欢迎:: $ this-> do_upload（）在另一个中的欢迎:: do_upload（）方法。

因此，当您在第二种方法中调用 $ this-> do_upload（）; 时， $ _ FILES 数组

。

这就是为什么 var_dump ['upload_data']）; 返回 NULL 。

来自 welcome / second_method 的文件，将表单请求发送到 welcome / second_method ，其中调用 $ this->然后按如下所示更改表单助手函数（在 View 中）：：

  //将'second_method'更改为您的方法名
 echo form_open_multipart / second_method'）; 
  





---

使用CodeIgniter上传档案

CodeIgniter 很好，通过使用文件上传库。

您可以查看用户指南中的示例代码;此外，为了更好地了解上传配置，请检查手册页末尾的配置项说明部分。

还有几个有关在CodeIgniter中上传文件的文章/示例，您可能需要考虑：

• 旁注： 在使用CodeIgniter示例代码之前，请确保已加载 url 和形式帮助函数：

    //在控制器中加载帮助文件
   $ this-> load-> helper（'form'）; 
   $ this-> load-> helper（'url'）; 
    

  
  
  

  ---

  
  
  
  

  In view

   <?php echo form_open_multipart('welcome/do_upload');?>
   <input type="file" name="userfile" size="20" />
  

  In controler

  function do_upload()
  {
      $config['upload_path'] = './uploads/';
      $config['allowed_types'] = 'gif|jpg|png';
      $config['max_size'] = '100';
      $config['max_width']  = '1024';
      $config['max_height']  = '768';
      $config['overwrite'] = TRUE;
      $config['encrypt_name'] = FALSE;
      $config['remove_spaces'] = TRUE;
      if ( ! is_dir($config['upload_path']) ) die("THE UPLOAD DIRECTORY DOES NOT EXIST");
      $this->load->library('upload', $config);
      if ( ! $this->upload->do_upload('userfile')) {
          echo 'error';
      } else {
  
          return array('upload_data' => $this->upload->data());
      }
  }
  

  And I call this function like this

   $this->data['data'] = $this->do_upload();
  

  and view this image:

  <ul>
  <?php foreach ($data['upload_data'] as $item => $value):?>
  <li><?php echo $item;?>: <?php echo $value;?></li>
  <?php endforeach; ?>
  </ul>
  

  I don't know what's the error.

  解决方案

  It seems the problem is you send the form request to welcome/do_upload, and call the Welcome::do_upload() method in another one by $this->do_upload().

  Hence when you call the $this->do_upload(); within your second method, the $_FILES array would be empty.

  And that's why var_dump($data['upload_data']); returns NULL.

  If you want to upload the file from welcome/second_method, send the form request to the welcome/second_method where you call $this->do_upload();.

  Then change the form helper function (within the View) as follows:

  // Change the 'second_method' to your method name
  echo form_open_multipart('welcome/second_method');
  

  ---

  File Uploading with CodeIgniter

  CodeIgniter has documented the Uploading process very well, by using the File Uploading library.

  You could take a look at the sample code in the user guide; And also, in order to get a better understanding of the uploading configs, Check the Config items Explanation section at the end of the manual page.

  Also there are couple of articles/samples about the file uploading in CodeIgniter, you might want to consider:

  • http://code.tutsplus.com/tutorials/how-to-upload-files-with-codeigniter-and-ajax--net-21684
  • http://runnable.com/UhIc93EfFJEMAADX/how-to-upload-file-in-codeigniter
  • http://jamshidhashimi.com/2011/06/14/image-upload-with-codeigniter-2/
  • http://code.tutsplus.com/tutorials/how-to-upload-files-with-codeigniter-and-ajax--net-21684
  • http://hashem.ir/CodeIgniter/libraries/file_uploading.html (CodeIgniter 3.0-dev User Guide)

  Just as a side-note: Make sure that you've loaded the url and form helper functions before using the CodeIgniter sample code:

  // Load the helper files within the Controller
  $this->load->helper('form');
  $this->load->helper('url');
  

  ---

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