How can the "header already sent" warning be resolved when using PHP scripts?

The "header already sent" warning in PHP occurs when there is output sent to the browser before calling the header() function to set HTTP headers. To resolve this issue, ensure that there is no whitespace or any output before calling the header() function. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer

Keywords

output buffering ob_start ob_end_flush headers php.ini

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