Including PHP files

Can generate an HTML in aggregating several PHP files

- include("file.php"): Include "file.php" and emit a warning if file.php is not accessible.
- require("file.php"): Include "file.php" and stop the program if file.php is not accessible

<?php
  require("header.php");
  require("navigation.php");
  require("body-home.php");
  require("footer.php");
?>