I am baffled, I have the following query which should return 4 records but for some reason it is counting 8 records and returning each row twice. I know I could use distinct, but as I also know that there are no duplicate records in this table I don't want to resolve the problem that way but find out what is causing it.

public function get_online_classes_per_dog($entry_id) {

        $sql = mysql_query("SELECT class_number FROM running_orders WHERE entry_id='".$entry_id."' ORDER BY class_number ASC");

        echo mysql_num_rows($sql);

        $results = mysql_fetch_array($sql);

        return $results;
    }

I have echo'd the $sql and run in directly in the database and I get 4 records as I should but echoing the mysql_num_rows gives me 8 and when I run a while or foreach loop on my main page I get each class_number eching out twice (for example it should be 1, 2, 3, 4 but I am getting 1, 1, 2, 2, 3, 3, 4, 4).

Any ideas, never come across anything like this before and is driving me mad??

What code is calling this function? This function just returns one record.

The code calling the function is

$classes_entered = new entries;
$class_entries = $classes_entered->get_online_classes_per_dog($entries['entry_id']);

This is set within a while loop but not sure what bearing it has on the query in the function as the echo of mysql_num_rows is within the function and all other function calls within the while loop work as expected.

I have been wondering why you thought the query only returned one record and realised I explained things slightly incorrectly - within the running orders table there are duplicate entry_ids (one for each class number entered) but the class numbers aren't duplicated, so in the case of my query above the result will be 4 class numbers for the one entry id. Hope this clarifies it better.

This is a big, complex page of code so I think the best thing (rather than keep trying to post bits of it on here) is that I will strip it right back and see if I can find a cause of the problem like that.