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// replace WordPress Howdy
function replace_howdy( $wp_admin_bar ) {
	$my_account=$wp_admin_bar->get_node('my-account');
	$newtitle = str_replace( 'Howdy,', 'Logged in as:', $my_account->title );
	$wp_admin_bar->add_node( array(
			'id' => 'my-account',
			'title' => $newtitle,
		) );
}
add_filter( 'admin_bar_menu', 'replace_howdy',25 );