dede缩略图变成/www/wwwroot/域名这样的链接格式的解决办法

/**
*  获得缩略图
*
* @access    public
* @param     string  $litpic  缩略图
* @param     string  $picname  图片名称
* @param     string  $isremote  是否远程
* @return    string
*/
function GetDDImage($litpic, $picname, $isremote)
{
global $cuserLogin,$cfg_ddimg_width,$cfg_ddimg_height,$cfg_basedir,$ddcfg_image_dir,$cfg_addon_savetype;
$ntime = time();
if( ($litpic != 'none' || $litpic != 'ddfirst') && 
!empty($_FILES[$litpic]['tmp_name']) && is_uploaded_file($_FILES[$litpic]['tmp_name']))
{
//如果用户自行上传缩略图
$istype = 0;
$sparr = Array("image/pjpeg", "image/jpeg", "image/gif", "image/png");
$_FILES[$litpic]['type'] = strtolower(trim($_FILES[$litpic]['type']));
if(!in_array($_FILES[$litpic]['type'], $sparr))
{
ShowMsg("上传的图片格式错误，请使用JPEG、GIF、PNG格式的其中一种！","-1");
exit();
}
$savepath = $ddcfg_image_dir.'/'.MyDate($cfg_addon_savetype, $ntime);

CreateDir($savepath);
$fullUrl = $savepath.'/'.dd2char(MyDate('mdHis', $ntime).$cuserLogin->getUserID().mt_rand(1000, 9999));
if(strtolower($_FILES[$litpic]['type']) == "image/gif")
{
$fullUrl = $fullUrl.".gif";
}
else if(strtolower($_FILES[$litpic]['type']) == "image/png")
{
$fullUrl = $fullUrl.".png";
}
else
{
$fullUrl = $fullUrl.".jpg";
}

@move_uploaded_file($_FILES[$litpic]['tmp_name'], $cfg_basedir.$fullUrl);
$litpic = $fullUrl;

if($GLOBALS['cfg_ddimg_full']=='Y') @ImageResizeNew($cfg_basedir.$fullUrl,$cfg_ddimg_width,$cfg_ddimg_height);
else @ImageResize($cfg_basedir.$fullUrl,$cfg_ddimg_width,$cfg_ddimg_height);

$img = $cfg_basedir.$litpic;

}
else
{

$picname = trim($picname);
if($isremote==1 && preg_match("#^http:\/\/#i", $picname))
{
$litpic = $picname;
$ddinfos = GetRemoteImage($litpic, $cuserLogin->getUserID());

if(!is_array($ddinfos))
{
$litpic = '';
}
else
{
$litpic = $ddinfos[0];
if($ddinfos[1] > $cfg_ddimg_width || $ddinfos[2] > $cfg_ddimg_height)
{
if($GLOBALS['cfg_ddimg_full']=='Y') @ImageResizeNew($cfg_basedir.$litpic,$cfg_ddimg_width,$cfg_ddimg_height);
else @ImageResize($cfg_basedir.$litpic,$cfg_ddimg_width,$cfg_ddimg_height);
}
}
}
else
{
if($litpic=='ddfirst' && !preg_match("#^http:\/\/#i", $picname))
{
$oldpic = $cfg_basedir.$picname;
$litpic = str_replace('.', '-lp.', $picname);
if($GLOBALS['cfg_ddimg_full']=='Y') @ImageResizeNew($oldpic,$cfg_ddimg_width,$cfg_ddimg_height,$cfg_basedir.$litpic);
else @ImageResize($oldpic,$cfg_ddimg_width,$cfg_ddimg_height,$cfg_basedir.$litpic);
if(!is_file($cfg_basedir.$litpic)) $litpic = $oldpic; 
}
else
{
$litpic = $picname;
return $litpic;
}
}
}
if($litpic=='litpic' || $litpic=='ddfirst') $litpic = '';
return $litpic;
}