How to Remove All Admin Bar Menu Items?

Question

I've seen techniques on how to remove specific Admin Bar items, but how do we do with those extra menus added by plugins/themes?

How to remove all Admin Bar items?

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Answer 1

I'm solving this getting all nodes from the Admin Bar, iterating through them and removing all that doesn't have a parent.

An exception is made to the User Actions menu ("Howdy, user_name"), which needs an extra checking.

add_action( 'admin_bar_menu', 'wpse_76491_admin_bar_menu', 200 );

function wpse_76491_admin_bar_menu() 
{
    global $wp_admin_bar;   
    if ( !is_object( $wp_admin_bar ) )
        return;

    // Clean the AdminBar
    $nodes = $wp_admin_bar->get_nodes();
    foreach( $nodes as $node )
    {
        // 'top-secondary' is used for the User Actions right side menu
        if( !$node->parent || 'top-secondary' == $node->parent )
        {
            $wp_admin_bar->remove_menu( $node->id );
        }           
    }
    // end Clean
}

This produces the following Admin Bar:

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The only remnant is the Debug Bar plugin, which is added with a priority of 1000.

add_action('admin_bar_menu', array(&$this, 'admin_bar_menu'), 1000);

The problem is that if we hook with a priority higher than 200, we cannot add items to the top-secondary node. And that's a mystery for me...

But ok, that's a developer item and shouldn't be an issue. And all 4 extra items added by plugins were removed.

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For completeness, an example of what to add after we clean up the Admin Bar. The following goes after // end Clean:

// Conditional button, 'Go to Site' or 'Go to Admin' rendered
$title_goto = is_admin() ? 'Go to site' : 'Go to admin';
$url_goto = is_admin() ? site_url() : admin_url();
$wp_admin_bar->add_menu( array( 
    'id' => 'go_to_site_or_admin', 
    'title' => $title_goto, 
    'href' => $url_goto
) );
// end Conditional button

// Conditional Logout or Profile button
$title_logout = is_admin() ? 'Logout' : 'Profile';
$url_logout = is_admin() ? wp_logout_url() : get_edit_profile_url( get_current_user_id() );
$wp_admin_bar->add_menu( array(
    'id'    => 'wp-custom-logout',
    'title' => $title_logout,
    'parent'=> 'top-secondary',
    'href'  => $url_logout
) );
// end Conditional Logout/Profile button

// Codex search form item
$codex_search = '<form target="_blank" method="get" action="http://wordpress.org/search/do-search.php">
    <input type="text" onblur="this.value=(this.value==\'\') ? \'Search the Codex\' : this.value;" onfocus="this.value=(this.value==\'Search the Codex\') ? \'\' : this.value;" maxlength="100" value="Search the Codex" name="search" class="adminbar-input">
</form>';

$wp_admin_bar->add_menu( array( 
    'parent' => 'top-secondary', 
    'title' => $codex_search, 
    'href' => FALSE 
) );

This will produce a different Admin Bar if viewing the admin or the site.