I can access to one site by few different URLs

Try this link and read the Google recommendations:


https://support.google.com/webmasters/an...9066?hl=en

Thanks! Thats interesting, and im a little less afraid now, but if you know how to redirect those pages to main, defined route, I would appreciate it.

I pass the required Controller's $data['canonical'] to the view and echo $canonical

PHP Code:

// Controller
$data['canonical']  = strtolower($this->uri->uri_string()); // 'quotations';

// View
<link rel="canonical" href="<?= base_url($canonical); ?> "> 


The above script has not been tested but you should get the general idea. It depends if you are using "Pretty Urls" or just index.php.

Try the script and test it with all URL variations. the canonical link should be identical in every case.