naming files

[zzz]

I need to allow a user to upload 3 files.

The files should be named as:

userName.jpg
userName1.jpg
userName2.jpg

Currently user can have one file userName.jpg

What is the best way to handle the naming of those files?

Shall I put all allowed names into an array and check against it when I allow file upload? Say, user has userName.jpg and userName2.jpg but deleted userName1.jpg.

$namesArray = array(userName.jpg, userName1.jpg, userName2.jpg);

I would need to count how manu files are already uploaded and then check their names by using something like:

$existingFiles = array(userName.jpg, userName2.jpg);
$countFiles = count($existingFiles);

if ($countFiles > 0) {
   foreach ($namesArray as $key) {
      if (!in_array($key, $existingFiles )) {
         $newName = $key;
      }
}

Sounds about right, but I'm not quite sure.

[Piranha]

Just one quick question regarding this: Are numbers allowed in the user name? If they are, how do you plan to separate kla1.jpg and kla1.jpg, the first one is the file from user "kla1" and the second one the second image from user "kla".

[zzz]

I used those names as an example, the actual user name is always alpha and the same length. it's a unique code generated by a script.