这个要看数据库结构了：

设计一种方案如下：

SQL:

create table boards(
     big integer unsigned,
    names varchar(30)
);

PHP:

$query = "select big,name from boards";
$result = mysql_query($query,$con);
while($row = mysql_fetch_assoc($result))
{
    $arr[$row['big']][] = $row['name'];
}


foreach($arr as $k =>$boards)
{
    foreach($boards as $i => $board)
    {}

}