如何在MySQL中获取带有帖子ID的帖子页面

Question

i wrote a query to get my posts with DESC order as you see its limitet to show 10 posts per page but how i can find the post with "pid = 18" in what page?

TABLE:

pid, posterid, content
1 , 26 , blabla
2 , 8 , sec balnla
3 , 9 , lollll
4 , 26 , orddddd
5 , 10 , sssssdsd
...

PHP:

function getComments($poster){
    $sql = "SELECT * FROM table WHERE posterid = $poster"
    $smt = $db->query($sql); 
    $total = $smt->rowCount();

    $result = $db->prepare($sql . " ORDER BY pid DESC $limit");
    $result->execute();
    while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
        $Comments[] = $row;
    }
    return [
        'comments' => $Comments,
        'total' => $total
    ];
}

NEEDED FUNCTION:

$poster = 26;
$pid = 18;
$posttperpage = 10;

public function getPostPage($pid, $poster, $posttperpage)
{
    $page = '';

    $totlaPosts = getComments($poster)['total']; //70

    $pages = $totlaPosts / $posttperpage; //7

    for($i=0, $i<$totlaPosts, $i--)
    {
        // ?????
        // i confuzed no idead what can i do :(

    }
    return $page; //it must be 2
}

Answer 1

Since pid is not necessarily consistent (you might have deleted some rows) you should have another query.

$stmt = $db->prepare("SELECT COUNT(1) FROM table WHERE pid <= ? AND poster = ?");
$stmt->execute([$pid, $poster]);
$count = $stmt->fetchColumn();

echo ceil($count / $posttperpage);

Answer 2

If you're looking to determine what page a post is on:

$k = 1;
for($i=0, $i<$pid; $i += $posttperpage){
    $page = $k;
    $k +=1;
}

//after loop $page now contains what page the post is on. 

Is this what you're looking for?

Answer 3

In your LIMIT 0,10 you have a range of 10 items per page, right? If you want to keep track of which page you are viewing you need a variable that behaves like this:

$range = 10;
$currentPage = 2;
$offset = $range * ($currentPage - 1);

Inside your query you can change that 0 to $offset and there you have it, if you find your result in with this query it means your pid is in page 2, you can also increase the $currentPage by 1 if you can't find your result and so on.

Answer 4

This algo is simple,

You need to know the total of row, the position of your specific post and number of post per page.

And you do like this :

floor(position_of_you_post / number_total_of_post * number_of_post_per_page)

so if you have 100 post with 10 post per page and your post is the number 51, you can do :

51 /100 * 10 = 5.1

so the post is on the page 5