How can the use of require_once() and session_start() in PHP files lead to loading errors?

Using require_once() and session_start() in PHP files can lead to loading errors if they are not placed correctly within the code. To avoid this issue, make sure to include require_once() statements at the beginning of the file before any other code and session_start() should be called before any output is sent to the browser. 

<?php
require_once('config.php'); // Include necessary files first
session_start(); // Start the session before any output

// Rest of the PHP code goes here
?>

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