How to create simple pagination in PHP page - php

Question

Below is my Code.
<?php
$folder_name=$_GET['folder_name'];
$dirname = "customized_kits/images/";
$images = glob($dirname."*");
$filecount = count( $images );
$i=0;
for($i=0;$i<200;$i++) { ?>
<div class="col-md-2"> <div class="photos">
<div id="images1">
<a href=# data-lightbox="roadtrip">
<?php
if($filecount>$i) {
$filename = substr($images[$i], strrpos($images[$i], '/') + 1);
echo '<img src="'.$images[$i].'" style="width:150px;height:150px" /><br/>';
?>
<i class="fa fa-remove"></i>
<?php } else {
echo '<a ><img style="width:150px;height:150px;background-color:#eee" /></a>';
} ?>
</div>
</div>
</div>
<?php } ?>
Here I created 200 boxes with foreach loop I want to show 20 divs for single page and with help of pagination I want to show other divs.I searched in many websites I didnt get exact answer please help me to get out of this issue.

Answer 1

Okay so from your code you can have 200 values of $i and you want to paginate them in segments of 20. Let us start off by adding a script above your code to get the range that needs to be displayed. Page number comes as a GET parameter in number. ex example.com/feeds?number=2.
<?php
$pageno = $_GET['number']; // Page number from frontend
// Now this value will give you 1,2,3 etc
$start = $pageno*20;
// $start contains the initial offset or the value of `$i` from to start
for($i=$start;$i<$start+20;$i++) {
// Will only show 20 elements on the page
}
?>
Remember this is a very basic example. Although i would recommend using range in sql query instead so you don't have to load the complete dataset in each query.
More explanation
Suppose you have M results and you want to show N results on each page, the results on page x would start from x*N to x*(N+1) pure math here. In your code you are iterating $i over the whole loop rather just iterate over that specific range to get results. The value of x is the example is the page number that we get from number in GET verb.