setcookie（）不在本地设置cookie

Question

I have a script that should be setting a cookie. On a webserver, it works just fine, however when I test it locally, it does not set.

The excerpt:

setcookie('sid', 'nv48thnuf39sonv', 0, '/', $_SERVER['HTTP_HOST']);

echo isset($_COOKIE['sid']) ? $_COOKIE['sid'] : '(empty)';

There is no output prior to the call of setcookie .

On the server it says (empty) on the first load and nv48thnuf39sonv on the second load (expected behavior). Via http://localhost/ , however, it says (empty) and never changes regardless of how many time I mash F5

Does anyone know what might be causing cookies to not be set?

Answer 1

It's your cookie domain.

It requires at least two dots ( . ) or your browser will consider it invalid, thus not storing the cookie. The easiest way to get around it is to simply set the cookie domain to null when your $_SERVER['HTTP_HOST'] is localhost:

$cookieDomain = $_SERVER['HTTP_HOST'] == 'localhost' ? null : $_SERVER['HTTP_HOST'];
setcookie('sid', 'nv48thnuf39sonv', 0, '/', $cookieDomain); 
echo isset($_COOKIE['sid']) ? $_COOKIE['sid'] : '(empty)';