How does the order of session_start() function placement affect PHP session functionality in terms of headers and output?

Placing the session_start() function before any output is sent to the browser ensures that session cookies are set in the HTTP headers correctly. If session_start() is called after any output, it may result in headers already being sent to the browser, causing issues with session functionality. 

<?php
// Place session_start() at the top of the PHP script
session_start();

// Rest of your PHP code goes here
?>

Keywords

session_start PHP headers output functionality

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