How can PHP be used in conjunction with Ajax requests to update information on a webpage without requiring a full reload?

When using PHP in conjunction with Ajax requests, you can update information on a webpage without requiring a full reload by sending an Ajax request to a PHP script that processes the data and returns the updated information. This allows for dynamic content updates without disrupting the user experience.

<?php
// Sample PHP script to process Ajax request and update information on webpage

// Check if the request is an Ajax request
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
    
    // Process the data sent via Ajax
    $data = $_POST['data'];
    
    // Perform any necessary database operations or calculations
    $updatedData = $data * 2;
    
    // Return the updated information as a JSON response
    echo json_encode(['updatedData' => $updatedData]);
    exit;
}
?>