renaming files

[hydrogen2]

<?
$fname = "article";
$fext = ".txt";
$newname = $fname . $fext;
$testname = "article.txt";
//checks for file upload
if(isset($UploadedFile))
{

	//uploads file
	copy($UploadedFile, $UploadedFile_name);

            //renames file to article.txt
            rename($UploadedFile_name, "article.txt");

            //checks if if article.txt already exists
            //after this point i need help
            if (file_exists($newname)) {
             while (file_exists($newname)){
             $number++;
             $fname = $fname . $number;
             $newname = $fname . $fext;

            } //end of while loop
            } //end of if statement 
	//file information
	print("Local File: $UploadedFile <BR>\n");
	print("Name: $UploadedFile_name <BR>\n");
	print("Size: $UploadedFile_size <BR>\n");
	print("Type: $UploadedFile_type <BR>\n");
	print("<HR>\n");
}

?>

[hydrogen2]

sorry forgot what i needed help with, this is what im trying to do.
i want to upload a text file from a webpage into a specified web dir, and i want to rename the file to articles.txt, if that exists, i want to rename it to articles1.txt, if that exist i want to rename it to articles2.txt,.. any help would be great, thanks!