WordPress内容仅限登录用户查看

function member( $atts, $content = null ) {
    if  ( is_user_logged_in() && !is_null( $content ) && !is_feed() ) {
        return $content;
        return '';
    } else {
        $yonlendir = get_permalink();
        $form = wp_login_form(array('echo' => false, 'redirect' => $yonlendir ));
        return $form;
    }
}
add_shortcode( 'mem', 'member' );