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Load site based on cookie value in PHP

~~I need to load site based on cookie, i write code to validate that like this.~~
~~`if(!isset($_COOKIE['cookie'])){~~
~~$domain = $_SERVER['SERVER_NAME'];~~
~~setcookie('cookie', $cookie, time() + 31536000, '/', $domain);~~
~~header('Location: '.$_SERVER['REQUEST_URI']); // reload~~
}`
~~But when cookie created first time i got error.~~
~~![Image alt text](https://software.codidact.com/uploads/pHbcvfbMSzD4182khvz56vDh)~~

I need to load a site based on a cookie. I wrote code to validate that, like this.
if(!isset($_COOKIE['cookie'])){
$domain = $_SERVER['SERVER_NAME'];
setcookie('cookie', $cookie, time() + 31536000, '/', $domain);
header('Location: '.$_SERVER['REQUEST_URI']); // reload
}
But when the cookie was created the first time I got this error:
![This page isn't working - redirected you too many times. Try clearing your cookies. ERR_TOO_MANY_REDIRECTS](https://software.codidact.com/uploads/pHbcvfbMSzD4182khvz56vDh)

php cookies http-headers geolocation reload

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