首先是观察，使用$upload_dir.\'/USER_PHOTOS\'.$user->user_login 可能会导致文件夹混乱wp-content/.

我建议wp-content/user-photos/user-login/. 下面的例子就是这样考虑的。

在您的情况下，您已经有了菜单项，为了完整起见，这是用于开发的子菜单：

add_action( \'admin_menu\', \'wpse_75873_folder_menu\' );

function wpse_75873_folder_menu() 
{
    add_media_page( 
        \'User Photos Media\', 
        \'User Photos\', 
        \'edit_posts\', 
        \'so-13416177\', 
        \'wpse_75873_display_page\' 
    );
}

function wpse_75873_display_page() 
{
    echo \'<div id="icon-upload" class="icon32"></div><h2>User Photos</h2>\';

    $baseDir = WP_CONTENT_DIR . \'/user-photos/\';
    $baseUrl = WP_CONTENT_URL . \'/user-photos/\';

    // build user folder
    global $current_user;
    get_currentuserinfo();
    $userDir = $baseDir . $current_user->data->user_login . \'/\';
    $userUrl = $baseUrl . $current_user->data->user_login . \'/\';

    if( !is_dir( $userDir ) )
    {
        echo \'<div style="margin-top:30px;font-size:2em;font-weight:bold;color:#f00">
            Folder does not exist!
            </div>\';
        return;
    }

    // build array with files in user folder
    $files = array();

    if ( $dir = opendir( $userDir ) ) 
    {
        while ( $file = readdir( $dir ) ) 
        {
            if ( $file != "." && $file != \'..\' ) 
            {
                if ( !is_dir( $userDir . $file ) ) 
                {
                    // Hide files that start with a dot
                    if( !so_834303_starts_with( $file, \'.\' ) ) 
                    {
                        $size = so_13416177_file_size( 
                            filesize( $userDir . $file ) 
                            );
                        $files[] = array( $file, $size );
                    }
                }
            }
        }       
        closedir($dir);     
    } 

    if ( empty( $files ) ) 
    {
        echo \'<div style="margin-top:30px;font-size:2em;font-weight:bold;color:#00f">
            No photos!
            </div>\';
    }
    else
    {
        ?>          
        <table class="widefat">
            <thead>
                <tr>
                    <th style="width:20%">Thumbnail</th>
                    <th>File</th>
                    <th>Size</th>
                </tr>
            </thead>
            <tfoot>
                <tr>
                    <th>Thumbnail</th>
                    <th>File</th>
                    <th>Size</th>
                </tr>
            </tfoot>
            <tbody>
        <?php

        foreach ($files as $file) 
        {
            ?>
               <tr>
                  <td><!-- THIS IS NOT A THUMBNAIL -->
                    <?php echo \'<img src="\' . $userUrl . $file[0] . \'" width="50">\'; ?>
                  </td>
                  <td>
                    <a href="<?php echo $userUrl . $file[0]; ?>">
                    <?php echo $file[0]; ?>
                    </a>
                 </td>
                 <td><b><?php echo $file[1]; ?></b></td>
               </tr>
            <?php
        }

        ?>
            </tbody>
        </table>
        <?php
    } // end else
}

// https://stackoverflow.com/q/834303
function so_834303_starts_with( $haystack, $needle )
{
    return !strncmp( $haystack, $needle, strlen( $needle ) );
}

// http://www.php.net/manual/en/function.filesize.php#110739
function so_13416177_file_size( $o, $depth=0 ) 
{
    if( $o > 1024 ) 
        return so_13416177_file_size( $o/1024, $depth+1 );

    $unit = array( \'B\', \'KB\', \'MB\', \'GB\', \'TB\', \'PB\', \'EB\', \'PB\', \'ZB\', \'YB\' );
    return sprintf( \'%.01f %s\', $o, $unit[$depth] );
}

基于recent Answer in StackOverflow. 对代码进行了修改和改进