What are the potential pitfalls of relying on session.gc_maxlifetime to manage session expiration in PHP?

Relying solely on session.gc_maxlifetime to manage session expiration in PHP can be risky as it only sets the maximum lifetime for garbage collection, not the actual session expiration time. To ensure sessions expire correctly, it's better to set the session cookie lifetime and the session expiration time manually. 

// Set session cookie lifetime
ini_set('session.cookie_lifetime', 3600); // 1 hour

// Set session expiration time
ini_set('session.gc_maxlifetime', 3600); // 1 hour

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session.gc_maxlifetime session expiration PHP session management potential pitfalls

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