function function_upload($name,$newname="",$dir="upload")
{
global $_FILES,$ext;

$return="";

$time=time();

$upload=trim($_FILES[$name]['tmp_name']);

$upload_name=trim($_FILES[$name]['name']);

$size=trim($_FILES[$name]['size']);

if(empty($upload) or empty($upload_name) or $size==0)
{
return $return;
}

$dir.="/".date("Y-m",$time);

if (is_uploaded_file($upload))
{
$ext=file_extension($upload_name);

if(liu_mkdir($dir))
{

if($newname!="")
{

$newname.=".".$ext;
//$newname=TIME_NOW.".".$ext;
}else{
//$newname=$upload_name;
$newname=$time.".".$ext;
}

if(move_uploaded_file($upload,$dir."/".$newname) and file_exists($dir."/".$newname))
{
chmod($dir."/".$newname,0755);
$return=$dir."/".$newname;
}
}

}

return $return;

}

function file_extension($filename)
{
return substr(strrchr($filename, '.'), 1);
}

function liu_mkdir($dir,$mode=0777)
{
if(is_dir($dir))
{

if(!is_writable($dir))
{

@chmod($dir,$mode);

}
return true;
}
else

{

$oldmask = @umask(0);

$partialpath = dirname($dir);

if(!liu_mkdir($partialpath,$mode))
{

return false;

}
else

{
return mkdir($dir,$mode);
}

}
}