分页控制有效页面的一种方法

我正在使用分页脚本来控制页面,以获取消息系统每页上显示的记录量。

我使用的代码如下:

                //PAGINATION//
        global $pagination;
        $total = $this->countInbox();

        $adjacents = 3;
        $targetpage = "messages.php?inbox"; //your file name
        $limit = 10; //how many items to show per page
        if(isset($_GET['page']))
        {
            $page = $_GET['page'];
        }else{
            $page = 0;
        }

        if($page){ 
            $start = ($page - 1) * $limit; //first item to display on this page
        }else{
            $start = 0;
        }
        /* Setup page vars for display. */
            if ($page == 0) $page = 1; //if no page var is given, default to 1.
            $prev = $page - 1; //previous page is current page - 1
            $next = $page + 1; //next page is current page + 1
            $lastpage = ceil($total/$limit); //lastpage.
            $lpm1 = $lastpage - 1; //last page minus 1

        /* CREATE THE PAGINATION */
        $counter = "";
        $pagination = "";
        if($lastpage > 1)
        { 
            $pagination .= "<ul class='pagination'>";
            if ($page > (int)$counter+1) {
                $pagination.= "<li><a href=\"$targetpage&page=$prev\"><</a></li>"; 
            }

            if ($lastpage < 7 + ($adjacents * 2)) 
            { 
                for ($counter = 1; $counter <= $lastpage; $counter++)
                {
                    if ($counter == $page)
                        $pagination.= "<li class='active'><a href='#' class='active'>$counter</a></li>";
                    else
                        $pagination.= "<li><a href=\"$targetpage&page=$counter\">$counter</a></li>"; 
                }
            }
            elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some
            {
                //close to beginning; only hide later pages
                if($page < 1 + ($adjacents * 2)) 
                {
                    for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
                    {
                        if ($counter == $page)
                            $pagination.= "<li class='active'><a href='#' class='active'>$counter</a></li>";
                        else
                            $pagination.= "<li ><a href=\"$targetpage&page=$counter\">$counter</a></li>"; 
                    }

                    $pagination.= "<li><a href=\"$targetpage&page=$lpm1\">$lpm1</a></li>";
                    $pagination.= "<li><a href=\"$targetpage&page=$lastpage\">$lastpage</a></li>"; 
                }
                //in middle; hide some front and some back
                elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
                {
                    $pagination.= "<li><a href=\"$targetpage&page=1\">1</a></li>";
                    $pagination.= "<li><a href=\"$targetpage&page=2\">2</a></li>";

                    for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
                    {
                        if ($counter == $page)
                            $pagination.= "<li class='active'><a href='#' class='active'>$counter</a></li>";
                        else
                            $pagination.= "<li><a href=\"$targetpage&page=$counter\">$counter</a></li>"; 
                    }

                    $pagination.= "<li><a href=\"$targetpage&page=$lpm1\">$lpm1</a></li>";
                    $pagination.= "<li><a href=\"$targetpage&page=$lastpage\">$lastpage</a></li>"; 
                }
                //close to end; only hide early pages
                else
                {
                    $pagination.= "<li><a href=\"$targetpage&page=1\">1</a></li>";
                    $pagination.= "<li><a href=\"$targetpage&page=2\">2</a></li>";

                    for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; 
                    $counter++)
                    {
                        if ($counter == $page)
                            $pagination.= "<li class='active'><a href='#' class='active'>$counter</a></li>";
                        else
                            $pagination.= "<li><a href=\"$targetpage&page=$counter\">$counter</a></li>"; 
                    }
                }
            }

            //next button
            if ($page < $counter - 1) 
                $pagination.= "<li><a href=\"$targetpage&page=$next\">></a></li>";
            else
                $pagination.= "";
            $pagination.= "</ul>\n"; 
        }

除了一件事之外,它工作得很好。如果我手动将一个页面输入到不存在的URL中,它会显示没有记录的页面,例如

如何停止手动输入,以便在页面=2或页面=3不存在时,自动将用户重定向到默认页面,如消息。php?收件箱

我已经在使用另一个函数来控制其他有效页面。

$validPages = array('inbox', 'archive','compose', 'mid', 'trash', 'deleted');
$pageFound = false;

foreach ($validPages as $validPage) {
if (isset($_GET[$validPage])) {
    $pageFound = true;
    break;
}
}

if (! $pageFound) {
header("Location: messages.php?inbox");
exit;
}

我想知道是否有一种方法可以在上面的函数中加入一个补丁。

提前谢谢你。