How Do You Update A Cookie In Php?

If I call setcookie() two times with the same cookie name, I get two cookies created.

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How bởi you update an existing cookie?

You can update a cookie value using setcookie() function, but you should địa chỉ "/" in the 4th argument which is the "path" argument, khổng lồ prevent creating another cookie with the same name.

i.e. setcookie("cookie_name", "cookie_value", time()+3600, "/");

A suggested expiration time for the 3rd argument:

$exp_time = time()+3600; /* expire in 1 hour */$exp_time = time()+86400; /* expire in 1 day */

You can"t update a cookie per se, you can however overwrite it.Otherwise, this is what you are looking for: http://php.net/manual/en/function.setcookie.php

It works. Be sure khổng lồ read "Common Pitfalls" from that page.

You can use the super global $_COOKIE<"cookie_name"> as well khổng lồ read cookies.

Make sure there is no echo before setcookie call. Setcookie communicates with browser through header, & if you called echo earlier, header+body is sent already và server cannot send setcookie to lớn browser via header anymore. That is why you might see it is not working.

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There should be a line lượt thích below in php vps log file reporting warning in this case:

DEFAULT: PHP Warning: Cannot modify header information - headers already sent by (output started at /path/to/your/script.php:YY) in /path/to/your/script.php on line XX
So while PHP will send two Set-Cookie: headers if instructed so, only the last one should persist in browsers.The Netscape cookie spec http://curl.haxx.se/rfc/cookie_spec.html says:

Instances of the same path & name will overwrite each other, with the latest instance taking precedence. Instances of the same path but different names will địa chỉ additional mappings.

However, it might be advisable lớn avoid such edge conditions. Restructure your application so it doesn"t need lớn override the already sent cookie.

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