What is the importance of using session_start() in each PHP file that needs to access the session data?

When working with session data in PHP, it is important to use session_start() at the beginning of each PHP file that needs to access the session data. This function initializes a session or resumes the current one, allowing you to store and retrieve session variables across different pages. Without session_start(), you won't be able to access the session data stored in $_SESSION. 

<?php
session_start();

// Your PHP code that accesses session data goes here
?>

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session_start PHP file session data importance access

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