if( !empty( $_SESSION['spotify_token'] ) && !empty( $_SESSION['spotify_expires'] ) ) {
    if ( $_SESSION['spotify_expires'] < time() ) {
        if( !empty($_SESSION['spotify_refresh_token']) ) {
            $spotify->session->refreshAccessToken( $_SESSION['spotify_refresh_token'] );
            $_SESSION['spotify_token'] = $spotify->session->getAccessToken();