PHP Cookie重定向问题

Question

I'm not exactly sure what the problem is but the cookies aren't available for subdomains. Is there any way around this, or is there a better way to set the cookies domain? Thanks!

<?php 
ini_set("session.cookie_domain", ".example.com"); 

// Set cookie and redirect when user change city 
if( isset($_POST['city']) && $_POST['city'] != '' ){ 
$cookie_expire = time() + 50400;  
setcookie('city', $_POST['city'], $cookie_expire, '/'); 

header("Location: http://".$_POST["city"].".example.com"); 
die(); 
} 

// Redirect if user selected default city 
if (isset($_COOKIE["city"])) { 
$subdomain = array_shift(explode(".",$_SERVER['HTTP_HOST'])); 

if ($_COOKIE["city"] != $subdomain) { 
    header("Location: http://".$_COOKIE["city"].".example.com"); 
    die(); 
} 
}

Answer 1

Try using $domain parameter of setcookie.

setcookie('city', $_POST['city'], $cookie_expire, '/', '.example.com'); // With leading dot for old browsers

See here: http://php.net/setcookie

Answer 2

如果Cookie路径为http://www.example.com/，并且您重定向到http://www.example.com （请注意缺少尾部/），请检查Cookie上的路径，某些浏览器会删除Cookie-在我的经验中。