What are some best practices to avoid the "headers already sent" error in PHP when developing a website with dynamic includes?

The "headers already sent" error in PHP occurs when output is sent to the browser before headers are set, which can happen when there is whitespace or HTML content before the opening <?php tag. To avoid this error, ensure that there is no output sent before setting headers, and use output buffering functions like ob_start() and ob_end_flush(). 

&lt;?php
ob_start(); // Start output buffering

// Your PHP code here

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

Keywords

output buffering ob_start ob_end_flush include require

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