http://php.flashwebhost.com/stefin/set_cookie.php

Code:
<?php


if (isset($_COOKIE['flipkartCustomer'])) {
    echo $_COOKIE['flipkartCustomer'] . ',Welcome to flipkart, SPECIAL OFFER- 50% OFF ON ALL GAMES';
exit;
}


if (isset($_POST['flipkartCustomer']) && strlen($_POST['flipkartCustomer']) > 5) {
   setcookie('flipkartCustomer', $_POST['flipkartCustomer'], time()+3600);
   echo 'COOKIE Set. Close the browser. Revisit this page, I will remember your name';
} else {


echo'
    Enter your name ?
    <form method="post" action="">
    <input type="text" name="flipkartCustomer">
    <button type="submit" name="whatever">Enter Name</button>
  ';
}