opencart href link depend on category_id

Am new in Opencart I need an If then statement that will load a different .tpl paged depend on category_id.

I tried but showing error like

Parse error: syntax error, unexpected 'if' (T_IF), expecting ')' in D:\xampp\htdocs\ramesh\lmw\catalog\controller\product\sub_category.php on line 28

This is my code

sub_category.php

foreach ($category_info as $result) {
            $data['categories'][] = array(
                'name' => $result['name'],
                'parent_id' => $result['parent_id'],
                'thumb' => $this->model_tool_image->resize($result['image'], $this->config->get('config_image_category_width'), $this->config->get('config_image_category_height')),
                'description' => utf8_substr(strip_tags(html_entity_decode($result['description'], ENT_QUOTES, 'UTF-8')), 0, $this->config->get('config_product_description_length')) . '..',
                #'href' => $this->url->link('product/filter', '&category_id=' . $result['category_id'])
                #'href' => $this->url->link('product/sub_category')
                if($result['category_id'] == 24)
                {
                'href' => $this->url->link('product/transmission', 'sub_category_id='.$result['parent_id'].'&category_id=' . $result['category_id'])
                }
                else
                {
                    'href' => $this->url->link('product/filter', 'sub_category_id='.$result['parent_id'].'&category_id=' . $result['category_id'])
                }
            );
        }