php search pagination is not working - php

Question

i can make pagination by query database and it works just fine. but when i use form to search from database, i can only get the first page data, the next page data won't show up.
i just cannot figure out how to maintain the search query..
this is my code. the problem should be in the url links in the pagination, but i just cannot see the problem
<?php
require('koneksi.php');
if(isset($_GET['search'])) {
$search = $_GET['search'];
$keyword = $_GET['keyword'];
$koneksi = mysqli_connect("localhost","root","","mycompany");
// find out how many rows are in the table
$sql = "SELECT COUNT(*) FROM product WHERE deskripsi LIKE '%" . $keyword . "%'";
$result = mysqli_query($koneksi,$sql);
$rss = mysqli_fetch_row($result);
$numrows = $rss[0];
//numbers or rows to show per page
$rowperpage = 6;
//find out total pages
$totalpages = ceil($numrows/$rowperpage);
//get the current page or set default
if(isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])) {
// cast var as int
$currentpage = (int) $_GET['currentpage'];
} else {
// default page number
$currentpage = 1;
} // end if
// if the current page is greater than total pages...
if($currentpage > $totalpages) {
// set current page to last page
$currentpage = $totalpages;
} // end if
// if current page is less than total pages...
if($currentpage < 1) {
// set current page to first page
$currentpage = 1;
} // end if
// the offset of the list, based on current page
$offset = ($currentpage - 1) * $rowperpage;
$sql = "SELECT * FROM product WHERE deskripsi LIKE '%" . $keyword . "%' LIMIT $offset, $rowperpage";
$result = mysqli_query($koneksi, $sql);
// while there are rows to be fetched
while ($list = mysqli_fetch_assoc($result)) {
// echo data
echo $list['product_code'];
echo "<br>";
echo $list['deskripsi'];
}
/****** build the pagination links ******/
// range of num links to show
$range = 6;
$url = "searchbar.php";
// if not on page 1, don't show back links
if($currentpage > 1) {
// show << link to go to page 1
echo "<a href='{$_SERVER['PHP_SELF']}?currentpage=1'> << </a>";
//get previous page num
$prevpage = $currentpage - 1;
} // end if
echo " <li class='arrow'><a href='$url?currentpage=prevpage?&keyword=$keyword?cari=$cari'>«</a></li> ";
for($x = ($currentpage - $range); $x < (($currentpage + $range) + 1); $x++) {
// if it is a valid page number
if(($x > 0) && ($x <= $totalpages)) {
// if we are on current page
if($x == $currentpage) {
echo "<li class=''><a href=''> $x </a></li>";
} else {
// make it a link
//echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$x'> $x </a> ";
//echo "<li class=''><a href='{$_SERVER['PHP_SELF']}?currentpage=$x'>$x </a></li>";
echo "<li class=''><a href='$url?currentpage=$x?&keyword=$keyword?cari=$cari'> $x </a></li>";
} // end else
} // end if
} // end for
// if not on last page, show forward and last page links
if ($currentpage != $totalpages) {
// get next page
$nextpage = $currentpage + 1;
// echo forward link for next page
echo " <li class='arrow'><a href='$url?currentpage=$nextpage?&keyword=$keyword?cari=$cari'>»</a></li> ";
// echo forward link for lastpage
// echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$totalpages'> >> </a> ";
} // end if
} // end if get search
require('footer.php');
?>

Answer 1

Looks like there could be a couple things missing here. For instance:
echo " <li class='arrow'><a href='$url?currentpage=prevpage?&keyword=$keyword?cari=$cari'>«</a></li> ";
in this line you are missing a $ for the prevpage: $prevpage but the querystring in the URL should only start with a ? and not contain question marks elsewhere, so this line should read more like
echo " <li class='arrow'><a href='$url?currentpage=$prevpage&keyword=$keyword&cari=$cari'>«</a></li> ";
I'm not 100% sure if that's going to fix your issue, but there is one big thing that I would ask you to look into before actually using this code anywhere and that's the SQL Injection that you have in your query.
You might read a bit of How can I prevent SQL injection in PHP? to get a better idea of how to rewrite your sql queries.
So, checkout your links, make sure the querystring is formatted correctly (http://host.com/script.php?querystring=something&var2=anothervar) where variables are separated only by &

Answer 2

As #aaronott pointed out, most of your links are wrong.
You are using cari=$cari which is not set anywhere, while in fact I guess you should add search=1 (or search=$search, but it's not really useful).
Also, you cannot have more than on ? in your querystring, so fix all your links like this:
...
if($currentpage > 1) {
echo "<a href='{$_SERVER['PHP_SELF']}?currentpage=1&search=1&keyword=$keyword'> << </a>";
$prevpage = $currentpage - 1;
}
echo " <li class='arrow'><a href='$url?currentpage=$prevpage&search=1&keyword=$keyword'>«</a></li> ";
...
if($x == $currentpage) {
echo "<li class=''><a href=''> $x </a></li>";
} else {
echo "<li class=''><a href='$url?currentpage=$x&search=1&keyword=$keyword'> $x </a></li>";
} // end else
...
echo " <li class='arrow'><a href='$url?currentpage=$nextpage&search=1&keyword=$keyword'>»</a></li> ";