Using the [0] first additional image on the category.tpl

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<div class="product-thumb">
            <div class="image"><a href="<?php echo $product['href']; ?>"><img src="<?php echo $product['thumb']; ?>" alt="<?php echo $product['name']; ?>" title="<?php echo $product['name']; ?>" class="img-responsive" /></a></div>
            <div>

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$data['products'][] = array(
	'product_id'  => $result['product_id'],
	'thumb'       => $image,

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$image_results = $this->model_catalog_product->getProductImages($result['product_id']);

if ($image_results) {
	$image2 = $this->model_tool_image->resize($image_results[0]['image'], $this->config->get($this->config->get('config_theme') . '_image_product_width'), $this->config->get($this->config->get('config_theme') . '_image_product_height'));
} else {
	$image2 = false;
}

$data['products'][] = array(
	'product_id'  => $result['product_id'],
	'thumb'       => $image,
	'thumb2'       => $image2,

Code: Select all

<?php if($product['thumb2']){ ?><img src="<?php echo $product['thumb2']; ?>"><?php } ?>