for ($i = 1; $i < count($ad_counter); $i++) { 
        $c_url = curl_init();
curl_setopt($c_url, CURLOPT_URL, "https:/example.com/page=".$i);
        curl_setopt($c_url, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($c_url, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($c_url, CURLOPT_POST, 0);  
        curl_setopt($c_url, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($c_url, CURLOPT_COOKIEFILE, "cookie.txt");     
        $response = (curl_exec($c_url));
        curl_close($c_url);

        $html = new simple_html_dom();
        $html -> load($response);

         foreach($html->find('div.zi2') as $an){
            $item['id'] = $an->find('input.checkbox', 0)->value;
            $ans[] = $item;
           
              }
}