What role does the session_start() function play in PHP scripts, and how can it affect header modification?

The session_start() function in PHP scripts initializes a session or resumes an existing one. It is important to call session_start() before any output is sent to the browser, including headers, to avoid "headers already sent" errors. To prevent header modification issues, make sure to call session_start() at the beginning of your PHP script before any HTML or output. 

<?php
session_start();

// Your PHP code here
?>

Keywords

session_start PHP scripts header modification session variables session management

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