What best practices should be followed to prevent the "Cannot modify header" error in PHP programming?

The "Cannot modify header information - headers already sent" error in PHP occurs when there is output sent to the browser before header functions like header() or setcookie() are called. To prevent this error, make sure there is no whitespace or output before header functions are called in your PHP code. 

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

// Your PHP code here

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

Keywords

header PHP output buffering ob_start ob_end_clean

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