How can the session_start() function in PHP affect the ability to update session variables?

When the session_start() function is called in PHP, it initializes a session or resumes an existing one. If session_start() is called before updating session variables, it can potentially cause issues with session data being overwritten or lost. To prevent this, always call session_start() before updating or accessing session variables in your PHP code. 

<?php
session_start();

// Update session variables here
$_SESSION['username'] = 'example_user';
$_SESSION['email'] = 'example@example.com';
?>

Keywords

session_start PHP session variables update functionality

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