What are some best practices for troubleshooting pagination issues in PHP scripts that involve MySQL queries?

Pagination issues in PHP scripts involving MySQL queries can often be caused by incorrect calculations for the LIMIT clause in the SQL query. To troubleshoot this, ensure that the LIMIT clause is correctly calculating the offset and limit based on the current page number and the number of items to display per page. Additionally, make sure that the total number of pages is calculated accurately to display the correct pagination links. 

// Calculate the offset and limit for the SQL query
$per_page = 10;
$page = isset($_GET['page']) ? $_GET['page'] : 1;
$offset = ($page - 1) * $per_page;

// Query to fetch data with pagination
$query = "SELECT * FROM table_name LIMIT $offset, $per_page";
$result = mysqli_query($connection, $query);

// Calculate total number of pages
$total_rows = mysqli_num_rows(mysqli_query($connection, "SELECT * FROM table_name"));
$total_pages = ceil($total_rows / $per_page);

// Display pagination links
for ($i = 1; $i <= $total_pages; $i++) {
    echo "<a href='?page=$i'>$i</a> ";
}

Keywords

pagination PHP MySQL troubleshooting queries

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