Insert either category ID or auto increment number into menu

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catalog/controller/common/header.php

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foreach ($categories as $category) {
	if ($category['top']) {
		// Level 2
		$children_data = array();

		$children = $this->model_catalog_category->getCategories($category['category_id']);

		foreach ($children as $child) {
			$filter_data = array(
				'filter_category_id'  => $child['category_id'],
				'filter_sub_category' => true
			);

			$children_data[] = array(
			
				/* add this */
				'category_id' => $child['category_id'],
				/* add this */
				
				'name'  => $child['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
				'href'  => $this->url->link('product/category', 'path=' . $category['category_id'] . '_' . $child['category_id'])
			);
		}

		// Level 1
		$data['categories'][] = array(
			
			/* add this */
			'category_id' => $category['category_id'],
			/* add this */
			
			'name'     => $category['name'],
			'children' => $children_data,
			'column'   => $category['column'] ? $category['column'] : 1,
			'href'     => $this->url->link('product/category', 'path=' . $category['category_id'])
		);
	}
}

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catalog/view/theme/default/template/common/header.tpl

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<div class="collapse navbar-collapse navbar-ex1-collapse">
  <ul class="nav navbar-nav">
	<?php foreach ($categories as $category) { ?>
	<?php if ($category['children']) { ?>
	<li id="menu-category-id<?php echo $category['category_id']; ?>" class="dropdown"><a href="<?php echo $category['href']; ?>" class="dropdown-toggle" data-toggle="dropdown"><?php echo $category['name']; ?></a>
	  <div class="dropdown-menu">
		<div class="dropdown-inner">
		  <?php foreach (array_chunk($category['children'], ceil(count($category['children']) / $category['column'])) as $children) { ?>
		  <ul class="list-unstyled">
			<?php foreach ($children as $child) { ?>
			<li id="menu-category-id<?php echo $child['category_id']; ?>"><a href="<?php echo $child['href']; ?>"><?php echo $child['name']; ?></a></li>
			<?php } ?>
		  </ul>
		  <?php } ?>
		</div>
		<a href="<?php echo $category['href']; ?>" class="see-all"><?php echo $text_all; ?> <?php echo $category['name']; ?></a> </div>
	</li>
	<?php } else { ?>
	<li id="menu-category-id<?php echo $category['category_id']; ?>"><a href="<?php echo $category['href']; ?>"><?php echo $category['name']; ?></a></li>
	<?php } ?>
	<?php } ?>
  </ul>
</div>