Answer:
a. $_COOKIE
Explanation:
$_COOKIE represents an associative array of Cookie name and value in PHP. For example in the code below we use the $_COOKIE construct to read the value of a cookie called 'testcookie' provided it has already been set.
<html>
<body>
<?php
if(!isset($_COOKIE["testcookie"])) {
echo "Cookie 'testcookie' is not defined!";
} else {
echo "Value of 'testcookie' is: " . $_COOKIE["testcookie"];
}
?>
</body>
</html>
