Simple Wordpress Secured Content Shortcode: Add this to your functions.php to enable [is_logged_in]Members only content[/is_logged_in] and [not_logged_in]Non Members content[/not_logged_in] in posts/pages

gistfile1.txt

function is_logged_in($atts, $content){
  if(is_user_logged_in()){
		return do_shortcode($content);
	}
	else {
    // this is used incase you want to attach an icon/message to show more information is available on login
		return "<span class='secured'></span>";
	}
}

add_shortcode( 'is_logged_in' , is_logged_in );

// simple function with opposite functionality to above
function not_logged_in($atts, $content){
  if(!is_user_logged_in()){
  	return do_shortcode($content);
	}
	else {
		return "<span class='member'></span>";
	}
}

add_shortcode( 'not_logged_in' , not_logged_in );