Suchfeld in Admin-Bar From http://fastwp.de/snippets/suchfeld-in-admin-bar/

wordpress-suchfeld-in-admin-bar.php

function adjust_admin_bar()
	{
	global $wp_admin_bar;
	if (!is_admin_bar_showing() or !is_admin())
		{
		return;
		}

	$form = '<form action="' . esc_url(admin_url('edit.php')) . '" method="get" id="adminbarsearch">';
	$form.= '<input class="adminbar-input" name="s" tabindex="1" type="text" value="" maxlength="50" />';
	$form.= '<input type="submit" class="adminbar-button" value="' . __('Search') . '"/>';
	$form.= '</form>';
	/* Suche einbinden */
	$wp_admin_bar->add_menu(array(
		'parent' => 'top-secondary',
		'id' => 'search',
		'title' => $form,
		'meta' => array(
			'class' => 'admin-bar-search'
		)
	));
	}

add_action('wp_before_admin_bar_render', 'adjust_admin_bar');