Should session_start() be included in every PHP file to access session values, or is it sufficient to include it once?

To access session values in PHP, session_start() needs to be called before accessing any session variables. It is sufficient to include session_start() once at the beginning of the file or in a separate file that is included in all the files where session values need to be accessed. 

<?php
session_start();

// Access session values here
$_SESSION['username'] = 'JohnDoe';
echo $_SESSION['username'];
?>

Keywords

session_start PHP file access session values include once

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