How can PHP beginners effectively troubleshoot and resolve errors related to headers already sent when working with session variables?

Issue: The "headers already sent" error occurs when PHP tries to send headers (like session_start()) after output has already been sent to the browser. To resolve this issue, make sure there is no whitespace or HTML content before session_start() is called. 

<?php
// Make sure there is no whitespace or HTML content before session_start()
session_start();

// Your PHP code here
?>

Keywords

PHP headers session variables troubleshooting errors

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