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Managing PHP sessions



if(session_id() == '') {
    session_start();
}
if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 1400)) {
    // last request was more than 30 minutes ago
    session_unset();     // unset $_SESSION variable for the run-time 
    session_destroy();   // destroy session data in storage
session_start();
}
$_SESSION['LAST_ACTIVITY'] = time(); // update last activity time stamp

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