# checking expiration tickers of individuals parameters, if any:
    my @expired_params = ();
    if ( $self->{_DATA}->{_SESSION_EXPIRE_LIST} ) {
        while (my ($param, $max_exp_interval) = each %{ $self->{_DATA}->{_SESSION_EXPIRE_LIST} } ) {
            if ( ($self->{_DATA}->{_SESSION_ATIME} + $max_exp_interval) <= time() ) {
                push @expired_params, $param;
            }
        }
    }
    $self->clear(\@expired_params) if @expired_params;