How can AJAX requests be utilized to execute PHP code without the need for opening a new window?

AJAX requests can be utilized to execute PHP code without the need for opening a new window by sending a request to a PHP file in the background and receiving the response asynchronously. This allows for dynamic content updates on a web page without requiring a full page reload. 

<?php
// PHP code to handle AJAX request
if(isset($_POST['data'])){
    $data = $_POST['data'];
    
    // Process the data or perform any desired operations
    
    // Return a response
    echo "Processed data: " . $data;
}
?>

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