because it is MySQL, couldn't you just use mysql_insert_id
http://www.php.net/manual/en/function.mysql-insert-id.php instead of
this:

   //now get the random number, and MD5 it to get it alphanumeric
   $query = 'SELECT MAX(uiIndex), cKey FROM randomKey GROUP BY cKey';
   $result = mysql_query($query, dbConnect($errorMsg));
   $row = mysql_fetch_object($result);

use this

  return md5(mysql_insert_id());

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