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);
  }

 }
}