Php 限制上载内容视图仅限管理员用户

我创建了一个新网站，用户正在将他们的文档上传到

wp uploads/documents/user\u name

文件夹中。这些文件可用的url如下

https://example/wp-content/uploads/documents/example/MP-final.pdf

这些文件是公开的，但我想保护它们不被公众访问。我希望这些文件只能供登录的管理员用户查看和下载

如何才能做到这一点

我现在的代码如下

关于htaccess

RewriteCond %{REQUEST_URI} \.(pdf|zip)$ [NC]
RewriteCond %{REQUEST_FILENAME} -s
RewriteRule ^wp-content/uploads/documents/(.*)$ dl-file.php?file=$1 [QSA,L]

dl-file.php代码如下

<?php
/*
 * dl-file.php
 *
 * Protect uploaded files with login.
 * 
 * @link http://wordpress.stackexchange.com/questions/37144/protect-wordpress-uploads-if-user-is-not-logged-in
 * 
 * @author hakre <http://hakre.wordpress.com/>
 * @license GPL-3.0+
 * @registry SPDX
 */
require_once('../../../wp-load.php');

is_user_logged_in() ||  auth_redirect();
list($basedir) = array_values(array_intersect_key(wp_upload_dir(), array('basedir' => 1)))+array(NULL);
 $basedir_new = $basedir .'/documents';
$file =  rtrim($basedir_new,'/').'/'.str_replace('..', '', isset($_GET[ 'file' ])?$_GET[ 'file' ]:'');

if (!$basedir || !is_file($file)) {
    status_header(404);
    die('404 &#8212; File not found.');
}
$mime = wp_check_filetype($file);
if( false === $mime[ 'type' ] && function_exists( 'mime_content_type' ) )
    $mime[ 'type' ] = mime_content_type( $file );
if( $mime[ 'type' ] )
    $mimetype = $mime[ 'type' ];
else
    $mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );
header( 'Content-Type: ' . $mimetype ); // always send this
if ( false === strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) )
    header( 'Content-Length: ' . filesize( $file ) );
$last_modified = gmdate( 'D, d M Y H:i:s', filemtime( $file ) );
$etag = '"' . md5( $last_modified ) . '"';
header( "Last-Modified: $last_modified GMT" );
header( 'ETag: ' . $etag );
header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );
// Support for Conditional GET
$client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;
if( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) )
    $_SERVER['HTTP_IF_MODIFIED_SINCE'] = false;
$client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
// If string is empty, return 0. If not, attempt to parse into a timestamp
$client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
// Make a timestamp for our most recent modification...
$modified_timestamp = strtotime($last_modified);
if ( ( $client_last_modified && $client_etag )
    ? ( ( $client_modified_timestamp >= $modified_timestamp) && ( $client_etag == $etag ) )
    : ( ( $client_modified_timestamp >= $modified_timestamp) || ( $client_etag == $etag ) )
    ) {
    status_header( 304 );
    exit;
}
// If we made it this far, just serve the file
readfile( $file );

---

阅读此@Vel，它将显示所有登录用户的文件，我希望限制只有管理员用户检查条件，如
是htaccess上的\u user\u logged\u in（）和\u admin（）。在php文件
dl file.php中