How can the "Cannot modify header information - headers already sent" error be resolved in PHP?

The "Cannot modify header information - headers already sent" error occurs in PHP when there is output sent to the browser before header functions are called. To resolve this issue, make sure there is no whitespace or output before calling header functions like header(), setcookie(), or session_start(). You can also use output buffering to capture any output before sending headers. 

<?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 header error_reporting

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