PHP: Cookies

Create cookie this way:
<?php
setcookie ("CookieName","Value");
//redirect to a main screen
header("Location: main.php");
?>

In the file main.php, test for the value:
<?php
if ($_COOKIE['CookieName'])
{
echo $_COOKIE['CookieName'];
}
else
{
echo "cookie could not be set";
}
?>