What are some best practices for managing and utilizing PHP files within a web development project?

One best practice for managing and utilizing PHP files within a web development project is to organize your code into separate files based on functionality or purpose. This can help improve code readability, maintainability, and reusability. Additionally, using include or require statements can help modularize your code and avoid repetition.

// Example of including a PHP file within another PHP file
<?php
include 'header.php';
?>

// Example of requiring a PHP file within another PHP file
<?php
require 'functions.php';