How to Implement PHP and MySQL Pagination for Large Datasets?

PHP and MySQL Pagination

One common task for web applications is to display large datasets in a paginated format, allowing users to view a limited number of results per page. This can enhance user experience and performance.

Consider a MySQL query that retrieves all records from the 'redirect' table filtered by a user ID:

SELECT * FROM redirect WHERE user_id = '".$_SESSION['user_id']."' ORDER BY 'timestamp'

To paginate this query such that it shows 10 results per page, follow these steps:

<?php

// Insert your MySQL connection code here

// Set the number of results per page
$perPage = 10;

// Get the current page number from GET request (or default to 1)
$page = (isset($_GET['page'])) ? (int)$_GET['page'] : 1;

// Calculate the starting record for the specified page
$startAt = $perPage * ($page - 1);

// Count the total number of records in the table
$query = "SELECT COUNT(*) as total FROM redirect
WHERE user_id = '".$_SESSION['user_id']."'";
$r = mysql_fetch_assoc(mysql_query($query));

// Calculate the total number of pages
$totalPages = ceil($r['total'] / $perPage);

// Generate the pagination links
$links = "";
for ($i = 1; $i <= $totalPages; $i++) {
  $links .= ($i != $page ) 
            ? "<a href='index.php?page=$i'>Page $i</a> "
            : "$page ";
}

// Execute the paginated query
$r = mysql_query($query);

$query = "SELECT * FROM `redirect`
WHERE `user_id`= '".$_SESSION['user_id']."' 
ORDER BY 'timestamp' LIMIT $startAt, $perPage";

$r = mysql_query($query);

// Display the results using the pagination system
echo $links; // Show links to other pages
?>

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