Classe de criação de Formulários PHP OO

[SpinXO]

Algum meio de evoluir este script? ou assim já está bom?

<?php

if (class_exists('Form') == FALSE) {

    class Form {

        public function openForm($method = NULL, $action = NULL) {
            $form = "<form ";
            $form .= (isset($method)) ? "method=\"{$method}\"" : "";
            $form .= (isset($action)) ? "action=\"{$action}\"" : "";
            $form .= ">";

            return $form;
        }

        public function inputCreate($type = NULL, $name = NULL, $ext = null) {
            $i = "<input ";
            $i .= (isset($type)) ? "type=\"{$type}\"" : "";
            $i .= (isset($name)) ? "name=\"{$name}\"" : "";
            $i .= (isset($ext)) ? "{$ext}" : "";
            $i .= "/>";

            return $i;
        }

        public function selectOpen($name = NULL, $ext = NULL) {
            $s = "<select ";
            $s .= (isset($name)) ? "name=\"{$name}\"" : "";
            $s .= (isset($ext)) ? "{$ext}" : "";
            $s .= ">";

            return $s;
        }

        public function option($val = NULL, $ext = NULL) {
            $o = "<option ";
            $o .= (isset($ext)) ? "{$ext}" : "";
            $o .= ">";
            
            return $o . "{$val}</option>";
        }

        public function selectClose() {
            return "</select>";
        }
        
        public function textOpen($name = NULL, $ext = NULL) {
            $t = "<textarea ";
            $t .= (isset($name)) ? "name=\"{$name}\"" : "";
            $t .= (isset($ext)) ? "{$ext}" : "";
            $t .= ">";
            
            return $t;
        }
        
        public function textClose() {
            return "</textarea>";
        }
        
        public function btnForm($title, $type = NULL, $name = null, $ext = NULL) {
            $b = "<button ";
            $b .= (isset($type)) ? "type=\"{$type}\"" : "";
            $b .= (isset($name)) ? "name=\"{$name}\"" : "";
            $b .= (isset($ext)) ? "{$ext}" : "";
            $b .= ">";
            
            return $b . "{$title}</button>";
        }

        public function closeForm() {
            return "</form>";
        }

    }

}