How can headers already being sent impact the functionality of PHP scripts?

When headers are sent before any output, it can cause PHP scripts to fail, as headers must be sent before any content. To solve this issue, ensure that no output is sent before calling functions like header() or setcookie(). If headers have already been sent, you can use output buffering to capture the output and prevent headers from being sent prematurely. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer

Keywords

headers_sent output buffering ob_start ob_end_flush buffer overflow

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