What are the best practices for handling session_start() in PHP to avoid header-related errors?

When using session_start() in PHP, it is important to ensure that it is called before any output is sent to the browser to avoid header-related errors. To address this issue, you can place session_start() at the very beginning of your PHP script, before any HTML or whitespace.

<?php
// Place session_start() at the very beginning of your PHP script
session_start();

// Your PHP code here
?>