这是我到目前为止的查询：

$result = num_rows("SELECT * FROM friends WHERE member_id = '".$_SESSION['userid']."'");
if($result >= 6) {
    $f_num = 6;
} else {
    $f_num = $result;
}
for($i = 1; $i <= $f_num; $i++) {
    $q_get_member_friends = MysqL_query("SELECT * FROM friends WHERE member_id = '".$_SESSION['userid']."' ORDER BY rand() LIMIT 1");
    $r_get_member_friends = MysqL_fetch_array($q_get_member_friends);
    echo $r_get_member_friends['friend_with'];
}

如果登录用户有多于或等于6个朋友,我想选择6个随机朋友

暂时坚持这一段时间：/

谢谢你的帮助 ：)