An HTTP cookie is a small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing.
bool setcookie( string $name [, string $value = "" [, int $expire = 0 [, string $path = "" [, string $domain = "" [, bool $secure = false [, bool $httponly = false ]]]]]] )
|name||The name of the cookie. This is also the key you can use to retrieve the value from the |
|value||The value to store in the cookie. This data is accessible to the browser so don't store anything sensitive here.|
|expire||A Unix timestamp representing when the cookie should expire. If set to zero the cookie will expire at the end of the session. If set to a number less than the current Unix timestamp the cookie will expire immediately.|
|path||The scope of the cookie. If set to |
|domain||The domain or subdomain the cookie is available on. If set to the bare domain |
|secure||When set to |
It is worth noting that mere invoking
setcookie function doesn't just put given data into
$_COOKIE superglobal array.
For example there is no point in doing:
setcookie("user", "Tom", time() + 86400, "/"); var_dump(isset($_COOKIE['user'])); // yields false or the previously set value
The value is not there yet, not until next page load. The function
setcookie just says "with next http connection tell the client (browser) to set this cookie". Then when the headers are sent to the browser, they contain this cookie header. The browser then checks if the cookie hasn't expired yet, and if not, then in http request it sends the cookie to the server and that's when PHP receives it and puts the contents into