How to set cookies for the entire folder?

Question

PHP

Good afternoon.
There was such a problem. Browsers have stopped setting cookies without the SameSite attribute via ajax. No matter how hard I tried, I couldn't. (SSl is not present).
After that, I decided to do it the old fashioned way in another file.
The scheme is like this. The form in index.php communicates via ajax with enter.php. As soon as the correct data is entered, there is a transition to cookie.php, where everything is rechecked and the cookie is set.
I put cookies like this, but for some reason they are displayed only in this file and disappear when you go to the Home page.
I know about the Path attribute. index.php (main) and cookie.php (the cookie is placed here) are in the same folder.
setcookie("login",$login, time()+60*60*24*365*10, '/');
Do not tell me what could be the problem? Thanks in advance.
PS
Displays in issues

Answer 1

and what hinders to set SameSite?

// PHP < 7.3
$path .= '; ' . $sameSite;
setcookie($name, $value, $expires, $path, $domain, $secure, $httpOnly)
// PHP >= 7.3
setcookie($name, $value, ['samesite' => 'Lax']);