Get logged in user info in WordPress

I need a shortcode that I can insert anywhere on my WordPress Post or Page, and it will show the Username of the current Logged in User. I tried this code: -------------------------------------------------------------------------------------- function show_loggedin_function( $atts ) { global $current_user, $user_login; get_currentuserinfo(); add_filter('widget_text', 'do_shortcode'); if ($user_login) return 'Welcome ' . $current_user->display_name . '!'; else return '<a href="' . wp_login_url() . ' ">Login</a>'; } add_shortcode( 'show_loggedin_as', 'show_loggedin_function' ); ------------------------------------------------------------------------------------ But it only outputted the shortcode instead of the Username as you can see here--https://prnt.sc/m5T4fJwLkAN6 How can I use your code to output the Logged in Username in a shortcode? Regards.

Use below code function show_loggedin_function() { global $current_user; wp_get_current_user(); if ( is_user_logged_in() ) { echo $current_user->display_name; } else { echo '<a href="' . wp_login_url() . ' ">Login</a>'; } } add_shortcode( 'show_loggedin_as', 'show_loggedin_function' );