OpenCart Community

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 $this->document->addLink($this->url->link('product/category', 'path=' . $category_id), 'canonical');

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    <modification>
       <id>Canonical Category Link</id>
       <version>1.0</version>
       <vqmver>1.2.3</vqmver>
       <author>uksb</author>
       <file name="catalog/controller/product/category.php">
          <operation>
             <search position="replace"><![CDATA[         $this->document->setKeywords($category_info['meta_keyword']);]]></search>
             <add><![CDATA[         $this->document->setKeywords($category_info['meta_keyword']);
             $this->document->addLink($this->url->link('product/category', 'path=' . $category_id), 'canonical');]]>
          
           </add>
          </operation>
       </file>
    </modification>

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	/** custom code used in code to add correct canonical meta tag to page
* Returns the path to a category in the format 1_2_3 
* @param int $category_id 
* @return string the path to the category 
*/
public function getCategoryPath($category_id){
			$path = '';
			   $category = $this->db->query("SELECT * FROM " . DB_PREFIX . "category c WHERE c.category_id = " .(int)($category_id));
	
   if($category->row['parent_id'] != 0){
			 $path .= $this->getCategoryPath($category->row['parent_id']) . '_';
	}
	
	$path .= $category->row['category_id'];
	
	 return $path;
}

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	/*added to add correct canonical meta tag to page*/
	$this->document->addLink($this->url->link('product/category', 'path=' . $this->model_catalog_category->getCategoryPath($category_id)), 'canonical');
	/*end of added to add correct canonical meta tag to page*/