How can headers already sent by error be resolved in PHP?

Headers already sent by error in PHP can be resolved by ensuring that no output is sent to the browser before headers are set using functions like `header()` or `setcookie()`. This error typically occurs when there is whitespace or other content sent before these functions are called. To resolve this issue, make sure that your PHP code does not output anything before setting headers. 

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

// Your PHP code here

ob_end_flush(); // End output buffering and send output

Keywords

output buffering ob_start ob_clean header php.ini

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