What are the potential pitfalls of using session_set_save_handler() to manage session garbage collection in PHP?

One potential pitfall of using session_set_save_handler() for session garbage collection in PHP is that it requires careful implementation to avoid potential security vulnerabilities, such as session fixation attacks. To mitigate this risk, developers should ensure that proper session regeneration techniques are used to prevent session fixation. Additionally, it's important to thoroughly test the custom session handler to ensure it functions correctly and securely. 

// Example of implementing session regeneration to prevent session fixation
session_start();
if (!isset($_SESSION['initiated'])) {
    session_regenerate_id();
    $_SESSION['initiated'] = true;
}

Keywords

session_set_save_handler session garbage collection PHP potential pitfalls

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