How does the session_start() function in PHP handle Session-IDs and user sessions?

The session_start() function in PHP is used to start a new session or resume an existing session. It handles Session-IDs by generating a unique identifier for each session and storing it in a cookie on the client side. This allows the server to identify the user's session and retrieve session data stored on the server. 

<?php
// Start or resume a session
session_start();

// Access session variables
$_SESSION['user_id'] = 123;
$_SESSION['username'] = 'john_doe';

// Destroy the session
session_destroy();
?>

Keywords

session_start PHP Session-IDs user sessions handling

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