What are some alternative methods to including PHP scripts in a database-driven frameset website?

Including PHP scripts directly in a database-driven frameset website can lead to security vulnerabilities and make the code difficult to manage. One alternative method is to use PHP includes to separate the logic from the presentation, making the code more modular and easier to maintain. Another option is to use AJAX to fetch data from the server without reloading the entire page, providing a more dynamic user experience.

// Using PHP includes to separate logic from presentation
<?php include 'header.php'; ?>
<?php include 'content.php'; ?>
<?php include 'footer.php'; ?>

// Using AJAX to fetch data from the server
<script>
  function fetchData() {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {
        document.getElementById("content").innerHTML = this.responseText;
      }
    };
    xhttp.open("GET", "fetch_data.php", true);
    xhttp.send();
  }
</script>