php pagination code is not working - php

Question

Can anyone point me out why my pagination is not working, What I am doing wrong here ? Working on it for a long time. my url generates like : http://localhost/medapp/admin/medorder.php?page=%209.
<?php
//pagination
$perpage = 3;
if (isset($_GET["page"])) {
$page = $_GET["page"];
}
else {
$page=1;
}
$start_from = ($page-1)*$perpage;
//pagination
$medorder = "SELECT * FROM `medorder` WHERE status='1' order by ID desc";
$result = $db->select($medorder);
if($result){
$i=0;
while($row = $result->fetch_assoc()) {
echo "<tr>";
echo "<td>".$i++."</td>";
echo "<td>".$row["uid"]."</td>";
echo "<td>".$row["fullname"]."</td>";
echo "</tr>";
}
// pagination
$query = "select * from medorder";
$result = $db->select($query);
$total_rows = mysqli_num_rows($result);
$total_pages = ceil($total_rows/$perpage);
echo "<span class='pagination'><a href='medorder.php?page=1'>".'First Page'."</a>";
for ($i=1; $i <= $total_pages; $i++) {
echo "<a href='medorder.php?page=".$i."'>".$i."</a>"; }
echo "<a href='medorder.php?page=$total_pages'>".'Last Page'."</a></span>";
//pagination
}
?>

Answer 1

Change your query like this by using LIMIT and OFFSET
$medorder = "SELECT * FROM `medorder` WHERE status='1' order by ID desc LIMIT $start_from,$perpage"; //

Answer 2

in this following line, you have a space before the $i variable:
echo "<a href='medorder.php?page= ".$i."'>".$i."</a>";
should be
echo "<a href='medorder.php?page=".$i."'>".$i."</a>";