Handling Cookies in Drupal

Working with cookies in Drupal 7

<?php
// Set a cookie.
$user_cookie = array('key'=>'value');
user_cookie_save($user_cookie));

// Print the cookie contents from Drupal.visitor.key
print $_COOKIE['Drupal_visitor_key']; //outputs value

// Delete the cookie
user_cookie_delete('key');
?>