wp_toolbar_sample.php

<?php

// remove WordPress items from toolbar
function preload_my_toolbar() {
  global $wp_admin_bar;
  
  // remove WordPress logo
  $wp_admin_bar->remove_node('wp-logo');
  
  // remove search button
  $wp_admin_bar->remove_node('search');
}
 
// add custom items to toolbar
function my_toolbar() {
  global $wp_admin_bar;
  
  // add a single link
  $wp_admin_bar->add_node( array(
  	    'id' => 'my-link-one',
  	    'title' => 'Item 1',
  	    'href' => site_url()
      ) );
      
  // add a item to the right of the menu using parent: top-secondary
  $wp_admin_bar->add_node( array(
  	    'id' => 'my-search',
  	    'title' => 'Search',
  	    'href' => '#',
    	  'parent' => 'top-secondary'
      ) );
  
  // add a sub-item
  $wp_admin_bar->add_node( array(
  	    'id' => 'my-google-search',
  	    'title' => 'Google',
  	    'parent' => 'my-search',
  	    'href' => 'http://www.google.com',
  	    'meta' =>array( 'target' => '_blank' )
      ) );
  
  // add another sub-item
  $wp_admin_bar->add_node( array(
  	    'id' => 'my-bing-search',
  	    'title' => 'Bing',
  	    'parent' => 'my-search',
  	    'href' => 'http://www.bing.com',
  	    'meta' =>array( 'target' => '_blank' )
      ) );
}