PHP pagination with multiple GET variables - php

Question

I'm struggling with pagination with 2 get variables - 1 of which being the page number.
My second $_GET variable I have is $_GET['cat'] which is getting the category of products I want to filter on.
Everything works with the pagination DISPLAY, number of pages etc., however, if I am filtered on a particular category, the first page of results displays fine, but when i try to get to the next page or any page number, nothing is displayed product wise.
Any help would be appreciated, please see code below.
<?php include("header.php");
echo '<div id="content_header"><center><h1> • Products • </h1></center></div>';
echo '<div id="products_left">
Show:<br />
<ul style="list-style-type:none; margin:0; padding:0;">
<li>Wedding Stationery</li>
<li>Frames</li>
<li>Nappy Cakes</li>
<li>Miscellaneous</li>
<li>All</li>
</ul>
</div>';
echo '<div id="clear"></div>';
echo '<div style="padding-left:150px; margin-top:-70px">';
$connect = mysqli_connect("localhost","root","") or die("Failed to connect to database");
mysqli_select_db($connect,"magical_moments") or die("Unable to find database");
if(empty($_GET['cat'])){
$query = mysqli_query($connect,"SELECT * FROM products");
} else {
$cat = $_GET['cat'];
$query = mysqli_query($connect,"SELECT * FROM products WHERE type='$cat'");
};
$products = mysqli_fetch_array($query);
$start = 0;
$limit = 9;
if(isset($_GET['page']))
{
$pid=$_GET['page'];
$start=($pid-1)*$limit;
}
else{
$pid=1;
}
//Fetch from database first 10 items which is its limit. For that when page open you can see first 10 items.
if(empty($_GET['cat'])){
$query = mysqli_query($connect,"SELECT * FROM products LIMIT $start, $limit");
} else {
$cat = $_GET['cat'];
$query = mysqli_query($connect,"SELECT * FROM products WHERE type='$cat' LIMIT $start, $limit");
};
?>
<ul>
<?php
//print 10 items
while($result=mysqli_fetch_array($query))
{
echo '<div id="display_product">
<table>
<tr>
<td><div id="product_image_holder" style="background-image:url('.$result[5].')"></div></td>
</tr>
<tr>
<td>'.$result[1].'</td>
</tr>
<tr>
<td>'.$result[3].'</td>
</tr>
<tr>
<td>£ '.$result[4].'</td>
</tr>
</table>
</div>';
}
echo '<div id="clear"></div>';
?>
</ul>
<?php
//fetch all the data from database.
echo '<div id="pagination_div">';
if(empty($_GET['cat'])) {
$rows=mysqli_num_rows(mysqli_query($connect,"SELECT * FROM products"));
//calculate total page number for the given table in the database
$total=ceil($rows/$limit);
if($pid>1)
{
//Go to previous page to show previous 10 items. If its in page 1 then it is inactive
echo "<a href='?page=".($pid-1)."' class='previous_button'>PREVIOUS</a>";
}
if($pid!=$total)
{
////Go to previous page to show next 10 items.
echo "<a href='?page=".($pid+1)."' class='next_button'>NEXT</a>";
}
//show all the page link with page number. When click on these numbers go to particular page.
for($i=1;$i<=$total;$i++)
{
if($i==$pid) { echo "<li class='current'>".$i."</li>"; }
else { echo "<li class='pagination'><a href='?page=".$i."'>".$i."</a></li>"; }
}
echo '</div>';
} else {
$rows=mysqli_num_rows(mysqli_query($connect,"SELECT * FROM products WHERE type='$cat'"));
//calculate total page number for the given table in the database
$total=ceil($rows/$limit);
// cat is set - pagination for cat + page
if($pid>1)
{
//Go to previous page to show previous 10 items. If its in page 1 then it is inactive
echo "<a href=".$_SERVER['REQUEST_URI']."?page=".($pid-1)." class='previous_button'>PREVIOUS</a>";
}
if($pid!=$total)
{
////Go to previous page to show next 10 items.
echo "<a href=".$_SERVER['REQUEST_URI']."?page=".($pid+1)." class='next_button'>NEXT</a>";
}
//show all the page link with page number. When click on these numbers go to particular page.
for($i=1;$i<=$total;$i++)
{
if($i==$pid) { echo "<li class='current'>".$i."</li>"; }
else { echo "<li class='pagination'>".$i."</li>"; }
}
echo '</div>';
};
?>
</ul>
</div>
<?php include("footer.php"); ?>

Answer 1

Well, you define the page parameter. But the category parameter is lost once clicked on a link because it's simply not there.
You've got this:
echo "<li class='pagination'>".$i."</li>";
You lack the parameter cat. Here's an example:
echo '<li class="pagination">'.$i.'</li>';