Isto é o que eu tenho atualmente:

$file_name = $HTTP_POST_FILES['uid']['name'];
$user= 'FILENAME';
$ext = pathinfo($file_name, PATHINFO_EXTENSION);
$new_file_name=$user . '.' . $ext;
$path= "uploads/images/users/".$new_file_name;
if($ufile !=none)
{
  if(copy($HTTP_POST_FILES['uid']['tmp_name'], $path))
  {
  echo "Successful<BR/>"; 
  echo "File Name :".$new_file_name."<BR/>"; 
  echo "File Size :".$HTTP_POST_FILES['uid']['size']."<BR/>"; 
  echo "File Type :".$HTTP_POST_FILES['uid']['type']."<BR/>"; 
  }
  else
  {
  echo "Error";
  }
}