Recipe 8.3 Reading Cookie Values
8.3.1 Problem
You want to read the value of a cookie
that's been previously set.
8.3.2 Solution
Look in the $_COOKIE
superglobal array:
if (isset($_COOKIE['flavor'])) {
print "You ate a $_COOKIE[flavor] cookie.";
}
8.3.3 Discussion
A cookie's value isn't available in
$_COOKIE during the request in which the cookie is
set. In other words, the setcookie( ) function
doesn't alter the value of
$_COOKIE. On subsequent requests, however, each
cookie is stored in $_COOKIE. If
register_globals is on, cookie
values are also assigned to global variables.
When a browser sends a cookie back to the server, it sends only the
value. You can't access the
cookie's domain, path, expiration time, or secure
status through $_COOKIE because the browser
doesn't send that to the server.
To print the names and values of all cookies sent in a particular
request, loop through the $_COOKIE array:
foreach ($_COOKIE as $cookie_name => $cookie_value) {
print "$cookie_name = $cookie_value<br>";
}
8.3.4 See Also
Recipe 8.2 shows how to set cookies; Recipe 8.4 shows how to delete cookies; Recipe 8.13 explains output buffering; Recipe 8.19 shows how to avoid the
"headers already sent" error
message that sometimes occurs when calling setcookie(
); Recipe 9.8 for information on
register_globals.
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