How does the usage of "session_start()" impact the handling of session variables in PHP applications, especially in scenarios like login/logout processes?

When using session variables in PHP applications, it is crucial to call session_start() at the beginning of each script that needs to access or modify session variables. This function initializes a session or resumes the current one, allowing the script to work with session data. In scenarios like login/logout processes, session_start() ensures that session variables are properly handled and maintained throughout the user's session. 

<?php
session_start();

// Code for login/logout processes

// Access or modify session variables
$_SESSION['username'] = 'example_user';

// Destroy the session on logout
session_destroy();
?>

Keywords

session_start() session variables PHP applications login process logout process

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