Codeigniter：上传后无法从文件夹中获取图像

Question

我刚刚学习了codeigniter，我找到了一些上传和从文件夹中获取图片的教程，而且函数do_upload（）可以工作并创建目录，但函数get_images（）不起作用

这是我的模特：

    var $gallery_path;
    var $gallery_path_url;

    function Gallery_model()
    {

        $this->gallery_path = realpath(APPPATH .'../images');
        $this->gallery_path_url = base_url().'images/';
    }

        function get_images(){
        $files = scandir($this->gallery_path.'thumbs');
        $files = array_diff($files, array('.', '..', 'thumbs'));

        $images = array();

        foreach ($files as $file){
            $images[] = array(
                    'url' => $this->gallery_path_url . $file,
                    'thumb_url' => $this->gallery_path_url . 'thumbs/' . $file
                );
        }
    }

控制器：

  function index()
    {
        $this->load->model('gallery_model');

        if($this->input->post('upload')){
            $this->gallery_model->do_upload();
        }

        $data['images'] = $this->gallery_model->get_images();

        $this->load->view("gallery", $data);
    }

查看：

<div id="gallery">
    <?php if(isset($images) && count($images)): 
        foreach ($images as $image):
     ?>
        <div class="thumb">
            <a href="<?php echo $image['url']; ?>">
                <img src="<?php echo $image['thumb_url']; ?>" />
            </a>
        </div>
    <?php endforeach; else: ?>
        <div id="blank_gallery">Please upload an image</div>
    <?php endif; ?>
</div>
<div id="upload">
    <?php
        echo form_open_multipart('gallery');
        echo form_upload('userfile');
        echo form_submit('upload', 'Upload');
        echo form_close();
    ?>
</div>