Cookie and session solution

Cookie and session & lt ;? Php & nbsp; setcookie (& quot; mm & quot;, & quot; gg & quot;); & nbsp; echo $ _ COOKIE [& quot; mm & quot;];? & Gt; two questions: (1) cookie and session
Setcookie ("mm", "gg ");
Echo $ _ COOKIE ["mm"];
?>

Two questions:

(1)
If no expiration time is set, the cookie will be automatically deleted when the browser is closed. Can the gg output be output after I close the browser under chrome?

(2)
The cookie must be refreshed once before it takes effect. This is because after setcookie, the server sends the cookie to the browser and refresh it again to send the cookie back.
So why does the session not need to be refreshed again? After all, isn't sessionID stored on the client a cookie? Don't you need to refresh the sessionID to facilitate server identification?

------ Solution --------------------

The session exists on the server, not on the client.
Discussion
Setcookie ("mm", "gg ");
Echo $ _ COOKIE ["mm"];
?>

Two questions:

(1)
If no expiration time is set, the cookie will be automatically deleted when the browser is closed. Can the gg output be output after I close the browser under chrome?

(2)
The cookie must be refreshed once before it takes effect. This is because after setcookie, the server sends the cookie to the browser ,......