Постраничная навигация

<?php
$num = 30;
$page = $_GET["page"];
$result = mysqli_query($mysqli, "SELECT COUNT(*) FROM `pack` WHERE `category`='$cat1'");
$posts = mysqli_fetch_all($result, 0);
$total = intval(($posts - 1) / $num) + 1;
$page = intval($page);
if(empty($page) or $page < 0) $page = 1;
if($page > $total) $page = $total;
$start = $page * $num - $num; 
$result = mysqli_query($mysqli, "SELECT * FROM `pack` WHERE `category`='$cat1' ORDER BY `name` LIMIT $start, $num");
 
while($postrow = mysqli_fetch_array ($result)){
...
Выборка из таблицы
...
}
 
if($page != 1) $pervpage = '<li><a href= ./category.php?p='.$category["category"].'&page=1>•••</a></li>';
if($page != $total) $nextpage = '<li><a href= ./category.php?p='.$category["category"].'&page=' .$total. '>•••</a></li>';
if($page - 2 > 0) $page2left = '<li><a href= ./category.php?p='.$category["category"].'&page='. ($page - 2) .'>'. ($page - 2) .'</a></li>';
if($page - 1 > 0) $page1left = '<li><a href= ./category.php?p='.$category["category"].'&page='. ($page - 1) .'>'. ($page - 1) .'</a></li>';
if($page + 2 <= $total) $page2right = '<li><a href= ./category.php?p='.$category["category"].'&page='. ($page + 2) .'>'. ($page + 2) .'</a></li>';
if($page + 1 <= $total) $page1right = '<li><a href= ./category.php?p='.$category["category"].'&page='. ($page + 1) .'>'. ($page + 1) .'</a></li>';

"SELECT * FROM `pack` WHERE `category`='$cat1' ORDER BY `name` LIMIT $start, $num"

$total = intval(($posts - 1) / $num) + 1;