How can session IDs be passed and recognized to identify which user belongs to which session in PHP?

Session IDs can be passed and recognized in PHP by using the `session_start()` function to start a session and generate a unique session ID for each user. This session ID can then be stored in a cookie or passed through URLs to identify which user belongs to which session. By using `session_id()` function, we can set or get the session ID to maintain the session across multiple pages. 

<?php
session_start();

// Get the session ID
$session_id = session_id();

// Set the session ID
session_id($session_id);
?>

Keywords

session ID PHP session management authentication user identification

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