What are the best practices for using PHP to update specific parts of a webpage without refreshing the entire content?

When updating specific parts of a webpage without refreshing the entire content, it is best to use AJAX (Asynchronous JavaScript and XML) in combination with PHP. AJAX allows for sending requests to the server in the background and updating only the necessary parts of the webpage dynamically. 

<?php
// PHP code to update specific parts of a webpage without refreshing

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Handle the AJAX request
    $data = $_POST['data'];
    
    // Process the data and generate the updated content
    
    // Return the updated content
    echo $updatedContent;
} else {
    // Handle the initial page load
    // Output the initial content of the webpage
}
?>

Keywords

AJAX jQuery DOM manipulation XMLHttpRequest server-side rendering

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