php在修改编辑是，总结

//前台回显
                        <select name="cat_id">
                            <option value="">选择分类</option>
                            <?php foreach ($catData as $k => $v): 
                                if($v['id'] == $data['cat_id'])
                                    $select = 'selected="selected"';
                                else 
                                    $select = '';
                            ?>
                                <option {$select} value="{$v.id}"><?php echo str_repeat('-',$v['level'] * 8); ?>{$v.cat_name}</option>
                            <?php endforeach; ?>
                        </select>
                        //后台输出数据
                        // 取出所有的商品类型
                        $typeModel = M('Type');
                        $typeData = $typeModel->select();
                        $this->assign('typeData', $typeData);
                        // 取出所有的商品分类
                        $catModel = D('Category');
                        $catData = $catModel->getTree();
                        $this->assign('catData', $catData);
                        // 取出所有的品牌
                        $brandModel = M('Brand');
                        $brandData = $brandModel->select();
                        $this->assign('brandData', $brandData);
                        // 取出所有的会员级别
                        $mlModel = M('MemberLevel');
                        $mlData = $mlModel->select();
                        $this->assign('mlData', $mlData);