How can the issue of "Cannot modify header information" be resolved in this context?

Issue: The "Cannot modify header information" error occurs when there is an attempt to send HTTP headers after content has already been sent to the browser. To resolve this issue, make sure that there is no output (such as HTML, whitespace, or error messages) before calling functions like header(). 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer
?>

Keywords

header output buffering ob_start ob_end_flush headers_sent

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