PHP can load different new data methods for each refresh

There's a lot of app, Each time you refresh, new content will be loaded , It's like never finishing painting . Instead of turning the page as we usually do , According to section 1,2,3 Page load data like this , I think of a way , For reference only .

$page = $_GET['page']?:1;
$uniqueNo = str_replace(".","_",getIp())."_".getDeviceid;// Generate a unique user id 
if ($page == 1){
   cache("loadPage_".$cate."_".$uniqueNo,null);// If it's the first page , Empty the loaded page number cache ,$cate Indicates the parameters required for list query , Generate a loaded page number cache for a specific conditional query 
}

$loadPage = cache("loadPage_".$cate."_".$uniqueNo)?:[];// Take out the loaded page number   Is an array 
$count = Db::name(tablename)->where($where)->cache(1800)->count();// Query the total amount of qualified data 
$limit = 10;
$totalPage = ceil($count/$limit);// Calculate the total number of pages 
$page = getRandPage($totalPage,$loadPage,$page);
if(!$page){// This indicates that the data has been loaded     
    $list = [];
}else{
    // Normal business processing 
    $start = ($page-1)*$limit;
    $list = Db::name(tablename)->where($where)->limit($start,$limit)->select();
    .
    .
    .
    // Add the current page number to the loaded page number cache 
    array_push($loadPage,$page);
    cache("loadPage_".$cate."_".$uniqueNo,$loadPage,1800);
}
/**
 * @param $totalPage  Total number of pages 
 * @param $usedPage  Loaded page number array 
 * @param int $isFirst  Is it the first page 
 * @return bool|int
 */
function getRandPage($totalPage,$usedPage,$isFirst = 1){
    // If only 1 page 
    if($totalPage == 1 && $isFirst==1){
        return 1;
    }
    // If the available page numbers have been taken , return false, Description data has ended 
    if(count($usedPage) >= $totalPage){
        return false;
    }
    // If it is the first time to turn the page , Remove the last page   Prevent users from getting the last page number when loading for the first time , And the data volume of the last page is less than one page ( Such as ：10 strip ) The situation of , The subsequent pages cannot be turned 
    if($isFirst == 1){
        $randPage = rand(1,$totalPage-1);
    }else{
        $randPage = rand(1,$totalPage);
    }

    if(!in_array($randPage,$usedPage)){
        return $randPage;
    }else{
        return getRandPage($totalPage,$usedPage,$isFirst);
    }
}

The above method also has a drawback , When the user turns many pages , There will be many elements in the loaded page number cache array , In the use of getRandPage Function to get random unused page numbers , Randomly generated page numbers may be stored in the loaded page number cache array , So you have to recycle once , Multiple cycles can cause some time-consuming problems .