Použijte funkci MySQL SEC_TO_TIME.
Příklad:
mysql> SELECT SEC_TO_TIME(2378);
-> '00:39:38'
Takže můžete napsat svůj SQL dotaz jako:
SELECT username, score, SEC_TO_TIME(timeran) as timetaken FROM gamescores ORDER BY Time DESC
Váš kód se poté změní na:
<?php
$result = mysql_query("SELECT username, score, SEC_TO_TIME(timeran) as timetaken FROM gamescores ORDER BY Time DESC");
if (mysql_num_rows($result)) {
for($rank=1; $row = mysql_fetch_assoc($result); $rank++) {
echo "<tr>
<td>{$rank}</td>
<td>{$row['username']}</td>
<td>{$row['timetaken']}</td>
<td>{$row['score']}</td>