Cara bikin function pagination

Awalnya kodenya gini gan

<?php
    $host   = 'localhost';
    $user   = 'root';
    $pass   = '';
    $db     = 'lrn_page';

    $link   = mysqli_connect($host, $user, $pass, $db) or die(mysqli_error($link));


    $perPage    = 3;//
    $page       = isset($_GET["halaman"]) ? (int)$_GET["halaman"] : 1 ;
    $start      = ($page > 1) ? ($page*$perPage)-$perPage : 0;

    // die('tes...' . $page);

    $articles = "SELECT * FROM page ORDER BY id_hal DESC LIMIT $start, $perPage";
    $result2 = mysqli_query($link, $articles);

    $result = mysqli_query($link, "SELECT * FROM page");
    $total  = mysqli_num_rows($result);

    $pages  = ceil($total/$perPage);
    // die('total..' . $total);
?>

<?php while($row = mysqli_fetch_assoc($result2)) { ?>
    <p> <?=$row["judul"];?> </p> <br>
<?php }?>

<div class = "">
    <?php for($i = 1; $i<=$pages; $i++) {?>
        <a href="?halaman=<?=$i?>"> <?=$i?> </a>
    <?php } ?>
</div>

Diatas itu tutorial belajar dari bang hilman, php pagination.Dan itu sudah work.

Nah, saya mau terapin di blog dan naruh beberapa bagiannya di function aja, supaya ga numpuk di index.php nya gan, terus saya ubah jadi gini.

 <!-- <?php

function panggil($aku){
    echo "saya memanggil " . $aku;
}

panggil('dia');

?> -->

<?php

function pagination(){

    $host   = 'localhost';
    $user   = 'root';
    $pass   = '';
    $db     = 'lrn_page';

    $link   = mysqli_connect($host, $user, $pass, $db) or die(mysqli_error($link));


    $perPage    = 3;//
    $page       = isset($_GET["halaman"]) ? (int)$_GET["halaman"] : 1 ;
    $start      = ($page > 1) ? ($page*$perPage)-$perPage : 0;

    // die('tes...' . $page);

    $articles = "SELECT * FROM page ORDER BY id_hal DESC LIMIT $start, $perPage";
    $result2 = mysqli_query($link, $articles);

    $result = mysqli_query($link, "SELECT * FROM page");
    $total  = mysqli_num_rows($result);

    // die('total..' . $total);

}
?>

<?php

pagination();

    while($row = mysqli_fetch_assoc($result2)) { ?>
    <p> <?=$row["judul"];?> </p> <br>
<?php }?>

<div class = "">
    <?php for($i = 1; $i<=$pages; $i++) {?>
        <a href="?halaman=<?=$i?>"> <?=$i?> </a>
    <?php } ?>
</div>

Hasilnya malah eror jadi gini gan

Notice: Undefined variable: result2 in C:\xampp\htdocs\lrn_page\index.php on line 47

Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, null given in C:\xampp\htdocs\lrn_page\index.php on line 47

Notice: Undefined variable: pages in C:\xampp\htdocs\lrn_page\index.php on line 52

Mohon pencerahannya, saya udah panggil fungsinya tapi variabel2nya nggak terpanggil gan.