How can one troubleshoot and resolve errors related to headers already sent in PHP scripts?

When headers are already sent in PHP scripts, it means that some content has already been output to the browser before the PHP script sends headers such as `header()` or `setcookie()`. To resolve this issue, make sure that there is no whitespace or any other output before the `header()` or `setcookie()` functions are called. 

<?php
ob_start(); // Start output buffering

// Your PHP code here

ob_end_flush(); // End output buffering and send output to the browser

Keywords

output buffering ob_start header ob_clean whitespace

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