Cookie Issue

PHP and Javascript can share cookies to each other, but not able to change cookie value that created by the other.

//7 days
setcookie('tree_lang', 'ENG', time() + 7*24*60*60, "/");

$_COOKIE['tree_lang'];

//7 days

setcookie('tree_lang', 'ENG', time() + 7*24*60*60, "/");

$_COOKIE['tree_lang'];

Reference:

Rex's Personal Site