How can the order of PHP functions like session_start(), session_destroy(), and header() impact the output in PHP scripts?

The order of PHP functions like session_start(), session_destroy(), and header() can impact the output in PHP scripts because the header() function must be called before any output is sent to the browser. If session_start() or session_destroy() output anything, it can cause issues with setting headers. To solve this issue, ensure that session_start() and session_destroy() are called before any output is sent and that header() is called before any content is echoed or printed. 

<?php
session_start();

// Perform operations with session data

session_destroy();

header("Location: index.php");
exit;
?>

Keywords

PHP session_start() session_destroy() header() output

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