如何在 CodeIgniter 中上传图片? [英] How to upload image in CodeIgniter?

问题描述

在视图中

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

在控制器中

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>

我不知道是什么错误.

推荐答案

看来问题是你将表单请求发送到 welcome/do_upload，并调用 Welcome::do_upload() 方法通过 $this->do_upload() 在另一个方法中使用.

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().

因此，当您在第二种方法中调用 $this->do_upload(); 时，$_FILES 数组将是 <强>空.

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

这就是为什么 var_dump($data['upload_data']); 返回 NULL.

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

如果您想从 welcome/second_method 上传文件，请将表单请求发送到您调用 $this->do_upload 的 welcome/second_method();.

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();.

然后将表单辅助函数(在View内)更改为如下¹:

Then change the form helper function (within the View) as follows¹:

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

---

使用 CodeIgniter 上传文件

CodeIgniter 已记录上传过程 非常好，通过使用文件上传库.

---

File Uploading with CodeIgniter

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

您可以查看用户指南中的示例代码；此外，为了更好地理解上传配置，请查看手册页末尾的配置项说明部分.

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.

还有几篇关于在 CodeIgniter 中上传文件的文章/示例，您可能需要考虑:

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/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 用户指南)

作为一个旁注:在使用 CodeIgniter 示例代码之前，请确保您已经加载了 url 和 form 辅助函数:

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');

// Load the helper files within the application/config/autoload
$autoload['helper'] = array('form', 'url');

这篇关于如何在 CodeIgniter 中上传图片?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！