How to implement final steps in pagination project? - php

Question

I am doing my first pagination implementation to my site. I feel like I am very close and just confusing my logic or mistaking the placement or actual value of some variables.
Here is the code:
$pgsize_wave = 40;
$pg_wave = (is_numeric($_GET["p"]) ? $_GET["p"] : 1);
$start = ($pg_wave-1)*$pgsize_wave;
$waves = mysql_query("SELECT * FROM `CysticAirwaves` LIMIT $start, $pgsize_wave");
$waves_total = mysql_query("SELECT COUNT(1) FROM `CysticAirwaves`");
$waves_total = mysql_fetch_row($waves_total);
$waves_total = $waves_total[0];
$max_pages = $waves_total / $pgsize_wave;
$max_pages = ceil($waves_total/$pgsize_waves);
?>
<div id="all_page_turn">
<ul>
<?php if($waves_total > 40 && $pg_wave >= 40) { ?>
<li class="PreviousPageBlog round_10px">
Previous Page
</li>
<?php } ?>
<?php if($waves_total > 40 && $pg_wave < ($waves_total-40)) { ?>
<li class="NextPageBlog round_10px">
Next Page
</li>
<?php } ?>
</ul>
</div>
To clarify any confusion, an airwave is a post from a user and I want to limit 40 per page. If it helps here is the query that pulls an airwave on the same page:
$query = "SELECT * FROM `CysticAirwaves` WHERE `FromUserID` = `ToUserID` AND `status` = 'active' ORDER BY `date` DESC, `time` DESC";
$request = mysql_query($query,$connection);
$counter = 0;
while($result = mysql_fetch_array($request)) {
$replies_q = "SELECT COUNT(`id`) FROM `CysticAirwaves_replies` WHERE `AirwaveID` = '" . $result['id'] . "' && `status` = 'active'";
$request2 = mysql_query($replies_q,$connection);
$replies = mysql_fetch_array($request2);
$replies_num = $replies['COUNT(`id`)'];
$counter++;
$waver = new User($result['FromUserID']);
Thanks so much in advance.

Answer 1

This is pseudo code but hopefully explains the logic.
$total = SELECT COUNT(*) FROM `waves`
$currentPage = 1 // changes through page parameter in URL
$wavesPerPage = 40
$totalPages = ceil($total / $wavesPerPage)
$offset = ($wavesPerPage * ($currentPage - 1)) + 1
$waves = mysql_query("SELECT * FROM `waves` LIMIT $offset, $wavesPerPage");
while ($row = mysql_fetch_assoc($waves)) {
echo $row['wave']
…
}
To output the pagination links:
if ($totalPages > 1) {
if ($currentPage > 1) {
printf('Previous', $currentPage - 1);
}
for ($i = 1; $i <= $totalPages; $i++) {
$class = ($i == $currentPage) ? 'selected' : null;
printf('Page %1$u', $i, $class);
}
if ($currentPage < $totalPages) {
printf('Next', $currentPage + 1);
}
}