How to show each subcategory products on category page

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$product_total = $this->model_catalog_product->getTotalProducts($data);	

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$subproducts = array(); 
				
				$productdata = array(
				'filter_category_id' => $result['category_id'],
                'sort'               => $sort,
				'order'              => $order,
			    'start'              => 0,
				'limit'              => 15
			    );
				
				$productresults = $this->model_catalog_product->getProducts($productdata);
				
				foreach ($productresults as $productresult) {
				if ($productresult['image']) {
					$image = $this->model_tool_image->resize($productresult['image'], $this->config->get('config_image_product_width'), $this->config->get('config_image_product_height'));
				} else {
					$image = false;
				}
				
				if (($this->config->get('config_customer_price') && $this->customer->isLogged()) || !$this->config->get('config_customer_price')) {
					$price = $this->currency->format($this->tax->calculate($productresult['price'], $productresult['tax_class_id'], $this->config->get('config_tax')));
				} else {
					$price = false;
				}
				
				if ((float)$productresult['special']) {
					$special = $this->currency->format($this->tax->calculate($productresult['special'], $productresult['tax_class_id'], $this->config->get('config_tax')));
				} else {
					$special = false;
				}	
				
				if ($this->config->get('config_tax')) {
					$tax = $this->currency->format((float)$productresult['special'] ? $productresult['special'] : $productresult['price']);
				} else {
					$tax = false;
				}				
				
				if ($this->config->get('config_review_status')) {
					$rating = (int)$productresult['rating'];
				} else {
					$rating = false;
				}
								
				$subproducts[] = array(
					'product_id'  => $productresult['product_id'],
					'thumb'       => $image,
					'name'        => $productresult['name'],
					'description' => utf8_substr(strip_tags(html_entity_decode($productresult['description'], ENT_QUOTES, 'UTF-8')), 0, 100) . '..',
					'price'       => $price,
					'special'     => $special,
					'tax'         => $tax,
					'rating'      => $productresult['rating'],
					'reviews'     => sprintf($this->language->get('text_reviews'), (int)$productresult['reviews']),
					'href'        => $this->url->link('product/product', 'path=' . $this->request->get['path'] . '&product_id=' . $productresult['product_id'] . $url)
				);
			}
			

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'name'  => $result['name'] . ($this->config->get('config_product_count') ? ' (' . $product_total . ')' : ''),

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'subproducts' => $subproducts,

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<?php if ($categories) { ?>
  <h2><?php echo $text_refine; ?></h2>
  <div class="category-list">
    <?php if (count($categories) <= 5) { ?>
    <ul>
      <?php foreach ($categories as $category) { ?>
      <li><a href="<?php echo $category['href']; ?>"><?php echo $category['name']; ?></a></li>
      <?php } ?>
    </ul>
    <?php } else { ?>
    <?php for ($i = 0; $i < count($categories);) { ?>
    <ul>
      <?php $j = $i + ceil(count($categories) / 4); ?>
      <?php for (; $i < $j; $i++) { ?>
      <?php if (isset($categories[$i])) { ?>
      <li><a href="<?php echo $categories[$i]['href']; ?>"><?php echo $categories[$i]['name']; ?></a></li>
      <?php } ?>
      <?php } ?>
    </ul>
    <?php } ?>
    <?php } ?>
  </div>
  <?php } ?>

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<?php if ($categories) { ?>
  <?php foreach ($categories as $category) { ?>
      <h2><a href="<?php echo $category['href']; ?>"><?php echo $category['name']; ?></a></h2>
	  <?php if ($category['subproducts']) { ?>
	  <div class="product-list">
    <?php foreach ($category['subproducts'] as $product) { ?>
    <div>
      <?php if ($product['thumb']) { ?>
      <div class="image"><a href="<?php echo $product['href']; ?>"><img src="<?php echo $product['thumb']; ?>" title="<?php echo $product['name']; ?>" alt="<?php echo $product['name']; ?>" /></a></div>
      <?php } ?>
      <div class="name"><a href="<?php echo $product['href']; ?>"><?php echo $product['name']; ?></a></div>
      <div class="description"><?php echo $product['description']; ?></div>
      <?php if ($product['price']) { ?>
      <div class="price">
        <?php if (!$product['special']) { ?>
        <?php echo $product['price']; ?>
        <?php } else { ?>
        <span class="price-old"><?php echo $product['price']; ?></span> <span class="price-new"><?php echo $product['special']; ?></span>
        <?php } ?>
        <?php if ($product['tax']) { ?>
        <br />
        <span class="price-tax"><?php echo $text_tax; ?> <?php echo $product['tax']; ?></span>
        <?php } ?>
      </div>
      <?php } ?>
      <?php if ($product['rating']) { ?>
      <div class="rating"><img src="catalog/view/theme/default/image/stars-<?php echo $product['rating']; ?>.png" alt="<?php echo $product['reviews']; ?>" /></div>
      <?php } ?>
      <div class="cart">
        <input type="button" value="<?php echo $button_cart; ?>" onclick="addToCart('<?php echo $product['product_id']; ?>');" class="button" />
      </div>
      <div class="wishlist"><a onclick="addToWishList('<?php echo $product['product_id']; ?>');"><?php echo $button_wishlist; ?></a></div>
      <div class="compare"><a onclick="addToCompare('<?php echo $product['product_id']; ?>');"><?php echo $button_compare; ?></a></div>
    </div>
    <?php } ?>
  </div>
	  <?php } ?>
  <?php } ?>