Tableau php de top vote

<?php
$arr = array();
$req = mysql_query('select * from votes');
while($dnn = mysql_fetch_array($req))
{
array_push($arr, $dnn['nombre_votes'].'@'.$dnn['username']);
}
rsort($arr);
?>
<?php


$id = -1;
$req = mysql_query('select * from votes');
while($dnn = mysql_fetch_array($req))
{
$id++;
$nbvote = $arr[$id];

$retour = mysql_query('SELECT * FROM votes WHERE nombre_votes=\'' .$nbvote. '\'')or die (mysql_error());
$donnees = mysql_fetch_array($retour);
$username = stripslashes($donnees['username']);
$retour2 = mysql_query('SELECT * FROM utilisateurs WHERE username=\'' .$username. '\'')or die (mysql_error());
$donnees2 = mysql_fetch_array($retour2);
$grade = stripslashes($donnees2['grade']);
?>
				
                     <tr>
                        <td><?php echo $id; ?></td>
                        <td><?php echo $username; ?></td>
			<td><?php echo $grade; ?></td>
			<td><?php echo $arr[$id]; ?></td> 
                     </tr>
<?php

}
?>