Setting a URL or URI as an Array Codeigniter -

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i have been reading url helper , uri user guide in codeigniter, not sure if can have, url or uri link array. 

example $data['action'] = $this->url->link('admin/dashboard');

or

example $data['action'] = $this->uri->string('admin/dashboard');

or 

example $data['action'] = $this->uri->segment('common/dashboard');

not sure correct way.

the right way is:

$data['action'] = site_url("admin/dashboard");

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