$idList = array();
$nameList = array();
foreach(array_keys($rounds2) as $k)
{
	$id 	= $rounds2[$k]['course_id'];
	$name = $rounds2[$k]['name'];
	$idList[$id] = 1;
	$nameList[$id] = $name;
}
foreach(array_keys($idList) as $id)
{
	$newarray[$id] = $nameList[$id];
}
asort($newarray);
$txt = "<select name='whatever'>";
foreach($newarray as $k => $v)
{
	$txt .= "<option value='{$k}'>{$v}</option>\n";
}
$txt .= "</select>";