What are common methods for dynamically loading content in PHP websites?

One common method for dynamically loading content in PHP websites is to use AJAX to fetch data from the server without reloading the entire page. This can be achieved by making an asynchronous request to a PHP script that returns the desired content in JSON format. The client-side JavaScript can then update the page with the new content.

```php
// PHP script to dynamically load content
if($_SERVER['REQUEST_METHOD'] == 'GET') {
    $content = ['message' => 'This is dynamically loaded content'];
    echo json_encode($content);
}
```

This PHP script can be called using AJAX from the client-side to dynamically load content on the website.