What are common issues with session variables being unexpectedly destroyed in PHP applications?

Common issues with session variables being unexpectedly destroyed in PHP applications can be caused by session timeouts, server misconfigurations, or unintentional calls to session_destroy(). To solve this issue, make sure to properly configure session settings, handle session regeneration, and avoid calling session_destroy() unless absolutely necessary. 

// Set session timeout to 30 minutes
ini_set('session.gc_maxlifetime', 1800);
session_set_cookie_params(1800);

// Regenerate session ID periodically
if (rand(1, 100) <= 5) { // 5% chance of regeneration
    session_regenerate_id(true);
}

// Avoid calling session_destroy() unless necessary
// session_destroy();

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