Remove the Wordpress Logo from the Admin Bar

functions.php

<?php 
/*
  This removes the Wordpress Logo from the admin dashboard
  Add this snippet to the functions.php file within your theme
*/
function remove_wordpress_logo() {
        global $wp_admin_bar;
        $wp_admin_bar->remove_menu('wp-logo');
}
add_action('wp_before_admin_bar_render', 'remove_wordpress_logo', 0);