What role does session_regenerate_id play in the ability to resume a session using a session ID in PHP?

When resuming a session using a session ID in PHP, it is important to regenerate the session ID to prevent session fixation attacks. The session_regenerate_id function in PHP generates a new session ID and transfers the session data to the new ID, effectively preventing session fixation attacks. 

session_start();

// Regenerate session ID to prevent session fixation attacks
session_regenerate_id();

// Resume session using the new session ID
$sessionId = $_GET['session_id']; // Assuming session ID is passed in the URL
session_id($sessionId);
session_start();

// Continue using the session data

Keywords

session_regenerate_id session resume session ID PHP

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