问题
I need to update a cookie. I do that in a php file called via ajax. This is is the code:
setcookie('items['.$_POST['id'].']');
The cookie does not update, in fact if I write print_r($_COOKIE['items']) after the setcookie function I see that $_COOKIE['items'] is the same that was before the call to setcookie function. How can I do?
回答1:
You cannot set and access a cookie in the same instance/page. You have to do a redirect or refresh after setting it.
In addition, you should do something like this instead :
setcookie("id","items['.{$_POST['id']}.']");
回答2:
You have to set the value for the key to access with $_COOKIE:
setcookie('items['.$_POST['id'].']', 'some_value');
Link to manual
回答3:
From php.net/manual/function.setcookie.php:
Cookies will not become visible until the next loading of a page that the cookie should be visible for. To test if a cookie was successfully set, check for the cookie on a next loading page before the cookie expires. Expire time is set via the expire parameter. A nice way to debug the existence of cookies is by simply calling print_r($_COOKIE);.
So the cookie will be accessible via $_COOKIE at the request of the PHP script.
回答4:
When you use setcookie is doesn't add the cookie to the superglobal $_COOKIE. You will have to do that yourself or reload the page. Also, since you are setting the cookie with an empty value, nothing would be set.
回答5:
This is syntax for setting a cookie
setcookie(name, value, expire, path, domain);
When you create a cookie, using the function setcookie, you must specify three arguments. These arguments are setcookie(name, value, expiration):
- name: The name of your cookie. You will use this name to later retrieve your cookie, so don't forget it!
- value: The value that is stored in your cookie. Common values are username(string) and last visit(date).
- expiration: The date when the cookie will expire and be deleted. If you do not set this expiration date, then it will be treated as a session cookie and be removed when the browser is restarted.
Note:- This will rewrite your cookie not update.
来源：https://stackoverflow.com/questions/8151893/php-cookie-doesnt-update