具有多个GET值的分页不能按预期工作

我有我的博客页面的url:www.something.com/index.php?menuid=6或仅www.something.com/?menuid=6

我想添加一个GET变量(页码，因为有太多的帖子显示在一个页面上)到当前的url，像这样:
www.something.com/index.php?id=6&page=12或www.something.com/?id=6&page=12

如果我不知道www.something.com和菜单的值，我应该在分页的<a href>中写什么?

我试过了:

$pagination = "<p>";
$pagination.= ($page <= 1) ? "First | " : "<a href='"{$_SERVER['REQUEST_URI']}&page=1'">First</a> | ";
$pagination.= ($page <= 1) ? "Previous | " : "<a href='"{$_SERVER['REQUEST_URI']}&page=".($page-1)."'">Previous</a> | ";
for ($i=1; $i<=$pages; $i++) {
    $pagination.= ($page == $i) ? "{$i} | " : "<a href='"{$_SERVER['REQUEST_URI']}&page={$i}'">{$i}</a> | ";
}
$pagination.= ($page >= $pages) ? "Next | " : "<a href='"{$_SERVER['REQUEST_URI']}&page=".($page+1)."'">Next</a> | ";
$pagination.= ($page >= $pages) ? "Last" : "<a href='"{$_SERVER['REQUEST_URI']}&page={$pages}'">Last</a>";
$pagination.= "</p>'n";

但是当我点击第二页和第三页时，结果是这样的:

index.php?menuid=6&page=2&page=3

我的另一个问题是，如何像这个一样只显示前两个和后两个页码?

这是用于分页的php代码:

$query = mysql_query("SELECT * FROM posts");
$howmuch = 5;
$total = mysql_num_rows($query); 
$page = (isset($_GET['page'])) ? $_GET['page'] : 1;
$pages = ceil($total/$howmuch);
$where = ($page-1)*$howmuch; 
$active="(SELECT s_id FROM status WHERE s_name='active')";
$sql = "SELECT post_id, post_title, post_content, post_date
        FROM posts
        WHERE post_s_id=".$active."
        ORDER BY post_id DESC
        LIMIT {$where}, {$howmuch}";
$result = mysql_query($sql);
$output="";
while ($row = mysql_fetch_assoc($result)) {
$output.="Here are the posts";
}
return $output.$pagination;

更新

! ! ! !
很抱歉，我忘了说，post .php包含在index.php中，上面的代码在post .php中。
menu_id在index.php的代码中，而不是在posts.php中，但是url是相同的。

$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME'].'?menuid='.$_GET['menuid'].'&page='.$page

function getPageUri($page) {
    $_GET['page'] = $page;
    foreach($_GET as $key => $value ) {
        $query_string[] = "$key=$value";
    }
    return $_SERVER['PHP_SELF'] . '?' . implode('&', $query_string);
}