Change name of uploaded file - php

Question

I have been trying to change the name of a file after an upload with my script.
I want every file to be named as "testing". Later I am going to change "testing" to a
variable that gets a unique name. Now I just want to change the name to "testing".
Also the script always says error although the file are uploaded.
Can I get some help here please?
Here is my code:
<?php
$uploadDir = 'images/'; //Image Upload Folder
if(isset($_POST['Submit']))
{
$fileName = $_FILES['Photo']['name'];
$tmpName = $_FILES['Photo']['tmp_name'];
$fileSize = $_FILES['Photo']['size'];
$fileType = $_FILES['Photo']['type'];
$filePath = $uploadDir . $fileName;
$result = move_uploaded_file($tmpName, $filePath);
if (!$result) {
echo "Error uploading file";
exit;
}
if(!get_magic_quotes_gpc())
{
$fileName = addslashes($fileName);
$filePath = addslashes($filePath);
}
$query = "INSERT INTO $db_table ( Image ) VALUES ('$filePath')";
mysql_query($query) or die('Error, query failed');
}
?>

Answer 1

I think you need
$fileName = "testing"; //maybe add extension
instead of getting original filename from $_FILES. Although after the file is moved you may end up with a situation of overwriting existing files as they all has the same name. To prevent that (for testing purposes) you may add something to $fileName, maybe a short random string.