How does session_start() function work in PHP and how does it relate to creating and managing Session IDs?

The session_start() function in PHP is used to start a new session or resume an existing session. It initializes the session data and generates a unique session ID for the user. This session ID is then stored in a cookie on the user's browser or passed through URLs. By calling session_start() at the beginning of a PHP script, you can access and manipulate session variables throughout the script. 

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

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

// Display session ID
echo "Session ID: " . session_id();
?>

Keywords

session_start PHP Session IDs session management cookies

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