php - Codeigniter 4 cookies issue not able to set

Solution:

Do not use die() because then the cookie will not be set. Let the method return instead so CI can output cookies and headers.

You do not need the helper, don't load it.

site_url() does not produce the string you should be using. It includes the protocol, i.e. https://example.com when all you should use is 'example.com'.

You have the domain and path arguments reversed and as others have said the call is to setCookie() as in

$this->response->setCookie('forgetpwd', $token, 3600, example.com);

The expire argument can be the life (in seconds) you want. The setCookie() method will add time() to it for you.

I don't supply a path argument because you need the default value of '/'.

Solution:

From php.net - https://www.php.net/manual/en/function.setcookie.php

Cookies will not become visible until the next loading of a page that the cookie should be visible for. To test if a cookie was successfully set, check for the cookie on a next loading page before the cookie expires. Expire time is set via the expires parameter. A nice way to debug the existence of cookies is by simply calling print_r($_COOKIE);.

Solution:

This code works for me. I get the cookie from the request and set it in the response. (Remember to validate the user input before processing it)

<?php

namespace App\Controllers;  
use Config\Services;

class Home extends BaseController {

    public function setLang($lang = ""){
        // remember filter your inputs
        Services::response()->setCookie('lang', $lang);
        echo("<script>location='/index';</script>");
    }

    public function index(){
        //default value
        $lang = "es";
        //if empty return NULL.
        $tmpLang = Services::request()->getCookie("lang");
        if(in_array($tmpLang, ["es", "en", "ja", "pt"])){
            $lang = $tmpLang;
        }
        //show cookie value
        echo $lang
    }
}

?>

Solution:

try using to redirect with cookies like

helper('cookie');    
set_cookie('cookie_name', 'value', 14400);    
return redirect()->to('url')->withCookies(); 

and on the page try getting by this way

print_r(get_cookie('cookie_name'));