PHPCon Poland 2024


(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)



現在のスクリプトに HTTP クッキーから渡された変数の連想配列です。

例1 $_COOKIE の例

echo 'Hello ' . htmlspecialchars($_COOKIE["name"]) . '!';

"name" というクッキーが事前に設定されているものとします。

上の例の出力は、 たとえば以下のようになります。

Hello Hannes!



これは 'スーパーグローバル' あるいは自動グローバル変数と呼ばれるものです。 スクリプト全体を通してすべてのスコープで使用することができます。 関数やメソッドの内部で使用する場合にも global $variable; とする必要はありません。

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User Contributed Notes 5 notes

kiril (at) atern (dot) us
8 years ago
To clarify the previously posted note:

Dots (.) and spaces ( ) in cookie names are being replaced with underscores (_).
k dot andris at gmail dot com
9 years ago
beware, dots (.) in cookie names are replaces by underscores (_)
rc at opelgt dot org
1 year ago
The values of $_COOKIE in general are not identic with the values in $_SERVER["HTTP_COOKIE"]!

In phpinfo() $_SERVER["HTTP_COOKIE"] shows the actual value stored in the cookie by the browser in 7bit.
In $_COOKIE is this value after a 7bit to 8bit conversion.

When all characters in $_SERVER["HTTP_COOKIE"] are in ASCII = 7bit, $_COOKIE is displayed in phpinfo(). When one single character is not in ASCII, phpinfo() shows no value!

Although in $_COOKIE is still the 8bit conversion of $_SERVER["HTTP_COOKIE"]!
The reason: the 8bit conversion alone is not enough to say what characters are meant.
For that the used character-set is necessary.

phpinfo() does not know the character-set and better says nothing.

When using $_COOKIE in a php-generated web page the environment has the info of used character-set and so the meant characters can be displayed.

Three illustrating examples
A HTML-form is used to get the content which shall be stored in a cookie named "test".

Input string in field "test": door
$_SERVER["HTTP_COOKIE"]: test=door
displayed in phpinfo(): door
displayed in any html page: door

Input string in field "test" (ISO-8859-1 used in form): Tür
displayed in phpinfo(): ""
displayed in a ISO-8859-1-html-page: Tür
(displayed in a UTF-8-html-page: T�r)

Input string in field "test" (UTF-8 used in form): Tür
displayed in phpinfo(): ""
displayed in a UTF-8-html-page: Tür
(displayed in a ISO-8859-1-html-page: Tür)
user at NOSPAM dot example dot com
1 year ago
PHP replaces dots (.) with underscores (_). To find all original cookie names (and value) you can use $_SERVER['HTTP_COOKIE'].

For example to retrieve a cookie set with <?php setcookie('testing.dots', 'value'); ?> you may use:
= explode('; ', $_SERVER['HTTP_COOKIE']);
$allCookies = [];

$cookies as $cookie) {
$keyAndValue = explode('=', $cookie);
$allCookies[$keyAndValue[0]] = $keyAndValue[1];

array(1) {
string(5) "value"

echo $allCookies['testing.dots'];
axodjakov at gmail dot com
2 years ago
$_COOKIE returns an array if there are more than one cookie saved under the given key.
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