How to Implement Pagination with PHP and MySQL for Large Datasets?

Pagination with PHP and MySQL

Paginating large datasets is a common task when designing responsive web applications. This article will demonstrate a method for implementing pagination with PHP and MySQL, allowing you to display a limited number of results per page.

Specifically, we aim to paginate the results of a hypothetical MySQL query that retrieves records from a table called 'redirect' based on a 'user_id' passed through a PHP session.

Code Implementation

To implement pagination, we can leverage the following PHP script:

<code class="php"><?php // MySQL connection code (not shown for brevity)

// Set pagination parameters
$perPage = 10;
$page = (isset($_GET['page'])) ? (int)$_GET['page'] : 1;
$startAt = $perPage * ($page - 1);

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

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

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


// Execute paginated query
$query = "SELECT * FROM 'redirect' WHERE 'user_id'= \''.$_SESSION['user_id'].' \' ORDER BY 'timestamp' LIMIT $startAt, $perPage";
$r = mysql_query($query);

// Display results and pagination links
// ...

echo $links; // display pagination links
?></code>

Explanation

• $perPage defines how many records to display per page.
• $page represents the current page being displayed.
• $startAt calculates the starting index of records for the current page.
• The COUNT(*) query calculates the total number of records to determine the number of pages required.
• Pagination links are generated with $links, and the active page is highlighted.
• Finally, a paginated MySQL query is executed, offsetting the results by $startAt and limiting the number of rows returned to $perPage.

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