How can the issue of "Cannot modify header information - headers already sent" be resolved in PHP scripts?

Issue: "Cannot modify header information - headers already sent" occurs when PHP tries to send headers (like cookies or location redirects) after output has already been sent to the browser. To resolve this, make sure to call header functions before any output is sent to the browser, including whitespace. Example PHP code snippet: 

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

// Your PHP code here

ob_end_flush(); // Flush output buffer

Keywords

header output buffering ob_start ob_end_flush error_reporting

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