How can PHP be integrated with JavaScript to achieve the desired outcome in this scenario?

To integrate PHP with JavaScript, you can use AJAX (Asynchronous JavaScript and XML) to make a request to a PHP file on the server, which can then process the data and return a response back to the JavaScript function. This allows for dynamic content loading without needing to reload the entire page.

```php
<?php
// PHP code to process the request and return a response
if(isset($_POST['data'])){
    $data = $_POST['data'];
    // Process the data as needed
    $response = "Processed data: " . $data;
    echo $response;
}
?>
```
Make sure to include this PHP code in a separate file (e.g., process.php) and then use JavaScript to make an AJAX request to this file.