What are the best practices for integrating PHP scripts on different servers to display data in HTML files using modern web development techniques?

To integrate PHP scripts on different servers to display data in HTML files using modern web development techniques, it is best to use AJAX to fetch data from the remote server and dynamically update the HTML content. This approach allows for seamless integration of PHP scripts across servers without the need to directly embed PHP code in HTML files.

// PHP script on Server A to fetch data from Server B
$url = 'http://serverB.com/data.php';
$data = file_get_contents($url);
echo $data;
```

```javascript
// AJAX request in HTML file to fetch data from Server A
$.ajax({
  url: 'http://serverA.com/script.php',
  method: 'GET',
  success: function(data) {
    $('#content').html(data);
  }
});