您已经设置了一个用于检查目录是否存在的标志。我已经更改了您的代码，使其能够根据您的需要工作。

<?php
public function upload($album_id, $album)
{
    $album = strtolower($album);
    $upload_config = array('upload_path' => './uploads/' . $album, 'allowed_types' =>
        'jpg|jpeg|gif|png', 'max_size' => '2000', 'max_width' => '680', 'max_height' =>
        '435', );
    $this->load->library('upload', $upload_config);
    // create an album if not already exist in uploads dir
    // wouldn't make more sence if this part is done if there are no errors and right before the upload ??
    if (!is_dir('uploads'))
    {
        mkdir('./uploads', 0777, true);
    }
    $dir_exist = true; // flag for checking the directory exist or not
    if (!is_dir('uploads/' . $album))
    {
        mkdir('./uploads/' . $album, 0777, true);
        $dir_exist = false; // dir not exist
    }
    else{
    }
    if (!$this->upload->do_upload('imgfile'))
    {
        // upload failed
        //delete dir if not exist before upload
        if(!$dir_exist)
          rmdir('./uploads/' . $album);
        return array('error' => $this->upload->display_errors('<span>', '</span>'));
    } else
    {
        // upload success
        $upload_data = $this->upload->data();
        return true;
    }
}
?>

接受的答案不是正确的方式

正确的方法是扩展Upload库

代码：

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
/**
 * File Uploading Class Extension
 *
 * @package     CodeIgniter
 * @subpackage  Libraries
 * @category    Uploads
 * @author      Harrison Emmanuel (Eharry.me)
 * @link        https://www.eharry.me/blog/post/my-codeigniter-upload-extension/
 */
class MY_Upload extends CI_Upload {
    /**
     * Validate Upload Path
     *
     * Verifies that it is a valid upload path with proper permissions.
     *
     * @return  bool
     */
    public function validate_upload_path()
    {
        if ($this->upload_path === '')
        {
            $this->set_error('upload_no_filepath', 'error');
            return FALSE;
        }
        if (realpath($this->upload_path) !== FALSE)
        {
            $this->upload_path = str_replace('''', '/', realpath($this->upload_path));
        }
        if ( ! is_dir($this->upload_path))
        {
            // EDIT: make directory and try again
            if ( ! mkdir ($this->upload_path, 0777, TRUE))
            {
                $this->set_error('upload_no_filepath', 'error');
                return FALSE;
            }
        }
        if ( ! is_really_writable($this->upload_path))
        {
            // EDIT: change directory mode
            if ( ! chmod($this->upload_path, 0777))
            {
                $this->set_error('upload_not_writable', 'error');
                return FALSE;
            }
        }
        $this->upload_path = preg_replace('/(.+?)'/*$/', '''1/',  $this->upload_path);
        return TRUE;
    }
}

如何使用：

只需创建application/libraries/MY_Upload.php并将上面的代码粘贴到其中即可。仅此而已！

更多信息：

• GitHub Gist
• 我在Eharry.me上的博客文章

注意：

此扩展与CodeIgniter3.x和2.x版本兼容。

如果它不存在，那么它将始终成为目录。

回答你的问题。。是的，在上传之前创建文件夹会更有意义。

试着放这个：

if (!is_dir('uploads')) {
    mkdir('./uploads', 0777, true);
        }
if (!is_dir('uploads/'.$album)) {
    mkdir('./uploads/'.$album, 0777, true);
        }

内部：

if (!$this->upload->do_upload('imgfile')) { 
        // upload failed
        return array('error' => $this->upload->display_errors('<span>', '</span>'));
    } else {
        // put if statements here.
        // upload success
        $upload_data = $this->upload->data();
        return true;
    }

所以它看起来是这样的：

if (!$this->upload->do_upload('imgfile')) { 
        // upload failed
        return array('error' => $this->upload->display_errors('<span>', '</span>'));
    } else {
        if (!is_dir('uploads')) {
        mkdir('./uploads', 0777, true);
    }
    if (!is_dir('uploads/'.$album)) {
        mkdir('./uploads/'.$album, 0777, true);
    }
        // upload success
        $upload_data = $this->upload->data();
        return true;
    }

如果我理解正确的话，这应该是你想要的。

希望能有所帮助。