Customize admin bar in Wordpress

wp_custom_admin_bar

/*
	top admin toolbar aka admin bar
	remove unnecessary admin toolbar items
	Version Tested: 3.6, 3.8
	Reference:
	http://wordpress.stackexchange.com/questions/47824/modify-admin-bar-link
*/
function custom_admin_bar_link() {
	global $wp_admin_bar;

	//Get a reference to the new-content node to modify.
    $new_content_node = $wp_admin_bar->get_node('new-content');
	
	// Parent Properties for new-content node:
        //$new_content_node->id     // 'new-content'
        //$new_content_node->title  // '<span class="ab-icon"></span><span class="ab-label">New</span>'
        //$new_content_node->parent // false
        //$new_content_node->href   // 'http://www.somedomain.com/wp-admin/post-new.php'
        //$new_content_node->group  // false
        //$new_content_node->meta['title']   // 'Add New'

    //Change href
    $new_content_node->href = 'edit.php?post_type=wo_shop';

    //Update Node.
    $wp_admin_bar->add_node($new_content_node);

    //Customize existing menu item in + New.
    $wp_admin_bar->remove_menu('new-post'); //new post link
	$wp_admin_bar->remove_menu('comments'); //new comments
	
	//further control between admin and other users
	if ( !is_super_admin() || !is_admin_bar_showing() )
		{
		$wp_admin_bar->remove_menu('new-page'); //new post page
		}
	
	//Customize an existing menu item in about.
	$wp_admin_bar->remove_menu('wp-logo-external'); //external link: documents, support forums, wordpress, feedback
	
	//a simple and clean way
	$args = array(
		'id'    => 'wp-logo',
		'href'  => 'http://www.example.com',
		'meta'  => array( 'title' => 'About example' )
	);
	$wp_admin_bar->add_node( $args ); //add if non exist or update existing object
	
	//alternative way to write the code
	$about_node = $wp_admin_bar->get_node('about');
	$about_node->href = 'http://www.example.com';
	$about_node->title = 'About example'; //display name, not the title in tag
	$about_node->meta = array( 'title' => 'About example' ); //html, class...
	$wp_admin_bar->add_node($about_node);
}
add_action( 'wp_before_admin_bar_render', 'custom_admin_bar_link' ); //if place in admin_bar_menu hook, too late to hide for some elements