Not able set the cookies getting the undefined index error.

<pre lang="PHP"><pre>  $cart_id = null;
  $cart_version = 1;
  if(isset($_COOKIE["cartid"])){
    $cart_id = $_COOKIE["cartid"];
      $cart_version = $_COOKIE["cart_version"];
  } else {
      $curl = curl_init();
    
    curl_setopt_array($curl, array(
      CURLOPT_URL => 'https://api.australia-southeast1.gcp.commercetools.com/commerce-tool-project/carts',
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_ENCODING => '',
      CURLOPT_MAXREDIRS => 10,
      CURLOPT_TIMEOUT => 0,
      CURLOPT_FOLLOWLOCATION => true,
      CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
      CURLOPT_CUSTOMREQUEST => 'POST',
      CURLOPT_POSTFIELDS =>'{
      "currency" : "EUR",
      "customerId" : "94fdb639-4f68-41b1-a886-cd75b5c3ab8b"
    }',
      CURLOPT_HTTPHEADER => array(
        'Content-Type: application/json',
        'Authorization: Bearer q2fSUOooANKEYuuHURXW82R0xs88CX4c'
      ),
    ));
    
    $response = curl_exec($curl);
    
    curl_close($curl);
    //echo $response;
    $datas = json_decode($response , true);
//echo '<pre>';
//print_r ($datas);
    echo $cart_id = $datas['id'];
    echo $cart_version = $datas['version'];
    setcookie("cartid", $cart_id, time() + 3600, '/');
    setcookie("cartversion", $cart_version, time() + 3600, '/');
    $cart_id = $_COOKIE["cartid"];
    $cart_version = $_COOKIE["cartversion"];
    echo "qwowe";
  }