// last login time of user
$_prefs['last_login'] = array(
    'value' => 0,
    'locked' => false,
    'shared' => false,
    'type' => 'implicit'
);

// show the last login time of user
$_prefs['show_last_login'] = array(
    'value' => 1,
    'locked' => false,
    'shared' => false,
    'type' => 'checkbox',
    'desc' => _("Show last login time when logging in")
);
