Codeigniter重定向添加动态第三个URI段

Codeigniter重定向添加动态第三个URI段,codeigniter,Codeigniter,我想把这个重定向到welcome/stats/3asumingsite\u idis3 function add_keyword() { $data = array( 'keyword' => $this->input->post('keywords'), 'depth' => $this->input->post('depth'), 'site_id' => $this->input->

welcome/stats/3

site\u id

3

function add_keyword()
{
    $data = array(
        'keyword' => $this->input->post('keywords'),
        'depth' => $this->input->post('depth'),
        'site_id' => $this->input->post('site_id')
    );

    $site_id = $this->input->post('site_id');

    $this->site_model->add_keyword($data);
    redirect('welcome/stats/', $site_id); 
}

$site\u id

redirect('welcome/stats/' . $site_id);