(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
$_COOKIE — HTTP Cookies
An associative array of variables passed to the current script via HTTP Cookies.
Note:
This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script. There is no need to do global $variable; to access it within functions or methods.
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https://www.php.net/manual/en/reserved.variables.cookies.php