bbp_admin_tools_feedback( string|WP_Error $message, string $class = false )

function bbp_admin_tools_feedback( $message, $class = false ) {
	if ( is_string( $message ) ) {
		$message = '<p>' . $message . '</p>';
		$class = $class ? $class : 'updated';
	} elseif ( is_wp_error( $message ) ) {
		$errors = $message->get_error_messages();

		switch ( count( $errors ) ) {
			case 0:
				return false;
				break;

			case 1:
				$message = '<p>' . $errors[0] . '</p>';
				break;

			default:
				$message = '<ul>' . "\n\t" . '<li>' . implode( '</li>' . "\n\t" . '<li>', $errors ) . '</li>' . "\n" . '</ul>';
				break;
		}

		$class = $class ? $class : 'error';
	} else {
		return false;
	}

	$message = '<div id="message" class="' . esc_attr( $class ) . '">' . $message . '</div>';
	$message = str_replace( "'", "\'", $message );
	$lambda  = create_function( '', "echo '$message';" );

	add_action( 'admin_notices', $lambda );

	return $lambda;
}