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Evitar duplicidades - ¿Es válido este código?

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Hola a todos.


Por motivos varios, he llegado a utilizar unas líneas de código, que según sus autores, solucionan el problema de duplicidad de contenidos para Google en nuestro querido Prestashop.


Quería dejaros aquí las dos opciones, en primer lugar, para ver si algún experto puede decirnos si realmente hacen los que prometen. 


Y en segundo lugar, pues que si funcionan, los tenéis aquí disponibles. 


En ambos casos, debéis editar el archivo HEADER.TPL de vuestra plantilla (themes/default-bootstrap para el tema por defecto), e introducir el código dentro de la etiqueta <head>


Caso / Ejemplo 1


<!-- canonical -->
{if isset($smarty.get.p) && !empty($smarty.get.p)}
{assign var="pagenumber" value={l s=' - Page %1$d' sprintf=$smarty.get.p} }
{assign var="pagination" value="?p={$smarty.get.p}" }
{assign var="pagenumber" value="" }
{assign var="pagination" value="" }
{assign 'pages_array' ['best-sales', 'new-products', 'adresses', '404', 'address', 'authentication', 'my-account', 'contact-form', 'discount', 'guest-tracking', 'index', 'history', 'manufacturer', 'order-opc', 'order-follow' ,'order-carrier' ,'order-payment', 'order-detail', 'order-slip', 'order-return', 'order-confirmation', 'order-address', 'password', 'search', 'prices-drop', 'sitemap', 'store-infos', 'stores', 'supplier-list', 'suppliers']}
{assign 'noindex_pages_array' ['404', 'address', 'my-account', 'guest-tracking', 'order-opc', 'order-follow' ,'order-carrier' ,'order-payment', 'order-detail', 'order-slip', 'order-confirmation', 'order-address', 'cart', 'search', 'supplier-list', 'supplier', 'suppliers']}
{if isset($smarty.server.REQUEST_URI)}
{assign 'noindex_vars' ['noredirect','orderway','orderby','content_only']}
{foreach from=$noindex_vars item=v}
{if stristr($smarty.server.REQUEST_URI,$v) }
{assign var=nobots value=true}
{if $page_name == 'product' && isset($product->id)}
<link rel="canonical" href="{$link->getProductLink($product->id)}" />
{elseif $page_name == 'manufacturer' && isset($manufacturer->id)}
<link rel="canonical" href="{$link->getManufacturerLink($manufacturer->id)}{$pagination}" />
{elseif $page_name == 'supplier' && isset($supplier->id)}
<link rel="canonical" href="{$link->getSupplierLink($supplier->id)}{$pagination}" />
{elseif $page_name == 'category' && isset($category->id)}
<link rel="canonical" href="{$link->getCategoryLink($category->id)}{$pagination}" />
{elseif in_array($page_name,$pages_array)}
<link rel="canonical" href="{$link->getPageLink($page_name)}" />
{elseif $page_name == 'cms' && isset($cms->id)}
<link rel="canonical" href="{$link->getCmsLink($cms->id)}" />
{assign var=amn value=explode("-",$page_name)}
{if strpos($page_name,"module-") !== false && count($amn) == 3}
<link rel="canonical" href="{$link->getModuleLink($amn.1,$amn.2)}{$pagination}" />
<link rel="canonical" href="{$base_dir|replace:'.fr/':'.fr'|replace:'http':'https'}{$request_uri|regex_replace:'/\?(.*)/':''|replace:'index.php':''}{$pagination}" />
{assign var=nobots value=true}
{if in_array($page_name,$noindex_pages_array)}
{assign var=nobots value=true}
<!-- canonical -->




Caso / Ejemplo 2


<!-- canonical -->
{if $page_name == 'index' or $page_name == 'search'}
<link rel="canonical" href="{$base_dir}" />
{elseif $page_name == 'category' or $page_name == 'best-sales' or $page_name == 'cart' 
or $page_name == 'discount' or $page_name == 'manufacturer' or $page_name == 'new-products'
or $page_name == 'prices-drop'}
<link rel="canonical" href="{$base_dir}
{$request_uri|substr:1|regex_replace:'/\/(.*)/':''|regex_replace:'/\?(.*)/':''}" />
<link rel="canonical" href="{$base_dir}{$request_uri|substr:1}" />
<!-- /canonical -->



Pues eso. A ver si alguien nos ilumina.....


Muchas gracias



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