How can headers already sent error be resolved in PHP when modifying header information?

Headers already sent error in PHP occurs when there is output sent to the browser before calling functions that modify header information, such as header() or setcookie(). To resolve this error, make sure that there is no whitespace or any other output before calling these functions. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer

Keywords

headers_sent ob_start ob_clean ob_end_flush output buffering

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