Wordpress User Info Short Code

User_Shortcodes

// display content to logged in users via shortcode
function member_only($atts, $content = null) {
	if (is_user_logged_in())
		return '<div class="memberContent">' . do_shortcode($content) . '</div>';
	return '';
}
add_shortcode('member_only', 'member_only');

// display content to logged out users via shortcode
function non_member($atts, $content = null) {
	if (!is_user_logged_in())
		return '<div class="nonMemberContent">' .do_shortcode($content) . '</div>';
	return '';
}
add_shortcode('non_member', 'non_member');

//display user id via shortcode
function member_id(){
    $current_user = wp_get_current_user();
	$member = $current_user->user_login;
	return $member;
}
add_shortcode('member_id', 'member_id');