php檔案服務,"虛擬掛載"其他目錄

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function base64url_encode($data) {
  return rtrim(strtr(base64_encode($data), ' /', '-_'), '=');
}
function base64url_decode($data) {
  return base64_decode(str_pad(strtr($data, '-_', ' /'), strlen($data) % 4, '=', STR_PAD_RIGHT));
}
function array_verify($var)
  {
   return isset($var)&&is_array($var) && count($var)>0;
  }
  function format_file_size($var)
  {
   if($var<1024) return $var.' B';
   if($var<1048576) return ($var/1024.0).' K';
   if($var<1073741824) return ($var/1048576.0).' M';
   return ($var/1073741824.0).' G';
  }

  $dir="F:";//不以/结尾
  $path="";

 if(array_verify($_GET)&&isset($_GET["path"]))
 {
  $path=base64url_decode($_GET["path"]);
  preg_match("#^[^/].*$|^.*.$|^..*$|./.|/.|./#",$path,$temp);
  		if(array_verify($temp))
			{
				echo
			   '


               ';
	          echo "警告 index.php?path=".$_GET["path"]." 非法url";
			  exit;
		    }
	$path=preg_replace("#[//]{2,}#","/",$path);
 }

if(is_dir($dir.$path))
    {
	echo '


          ';
	echo "目录   ".$path."";

	$dir_res=opendir($dir.$path);
	while($filen=readdir($dir_res))
	    {
		    if($filen!='.'&&$filen!='..')
		    {
		        if(is_file($dir.$path.'/'.$filen))
		        {
		             echo ''.$filen.' ('.format_file_size(filesize($dir.$path.'/'.$filen)).")n";
	            }else
			        {
			             echo ''.$filen."n";
			        }

	        }else if($filen=='..')
	            {
		             preg_match("#([^/] /小左)*[^/] (?=/)#",$path,$parent);
			         if(array_verify($parent))
			            {
		                     echo ''.$filen."n";
		                }else
						    {
			                     echo ''.$filen."n";
			                }
		        }
	    }
	echo '
         ';
	}
    else if(is_file($dir.$path))
	       {
                $file_size = filesize($dir.$path);
                header("Content-type: application/octet-stream");
                header("Accept-Ranges: bytes");
                header("Accept-Length: ".$file_size);
                Header("Content-Disposition: attachment; filename=".basename($dir.$path));
                readfile($dir.$path);//大文件请选择其他方式
           }else
            echo "警告:非法访问!";

?>