$_COOKIE¶
The $_COOKIE variable is a special superglobal variable that stores the name and values of the cookies that were transmitted to the webserver.
The $_COOKIE variable is an associative array where the keys are the cookies names and the values are the corresponding values passed in the HTTP headers.
$_COOKIE is a superglobal: it is always available, in every scope.
Values inside $_COOKIE are always strings or arrays.
<?php
echo $_COOKIE['username'];
?>
Related : $_GET, $_POST, $_REQUEST, $_SERVER, $_FILES, $_ENV
