Are there any common pitfalls to avoid when working with sessions and functions in PHP?

One common pitfall to avoid when working with sessions and functions in PHP is not starting the session before trying to access session variables. To solve this issue, make sure to call `session_start()` at the beginning of your script before using any session variables. 

<?php
// Start the session
session_start();

// Access session variables
$_SESSION['username'] = 'JohnDoe';
?>

Keywords

session functions PHP errors security

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