What potential issues can arise when using session variables in PHP, especially when accessed from different devices or networks?

When using session variables in PHP, potential issues can arise when accessed from different devices or networks due to session hijacking or session fixation attacks. To mitigate these risks, it is recommended to regenerate the session ID after a successful login or when the user's privilege level changes. 

// Regenerate session ID after successful login or privilege level change
session_start();
if(isset($_SESSION['logged_in']) && $_SESSION['logged_in'] == true) {
    session_regenerate_id(true);
}

Keywords

session variables PHP cross-device cross-network security vulnerabilities

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