http://php.flashwebhost.com/annie/numbergame.php
Code:
<?php
session_start();
if (isset($_SESSION['secretNumber'])) {
$secretNumber = $_SESSION['secretNumber'];
} else {
$secretNumber = rand(1,100);
$_SESSION['secretNumber'] = $secretNumber;
}
if (isset($_POST['userNumber'])) {
if ($_POST['userNumber'] == $secretNumber) {
$_SESSION ['secretNumber'] = rand(1,100);
}
}
?>
<html>
<body>


<h1> Number Guessing Game. </h1>
<?php

if (isset($_POST['userNumber'])) { 
$userNumber = $_POST['userNumber'];
if ($secretNumber > $userNumber) {
echo '<h1 style="color:red">Your number is too SMALL.</h1>';
} else if ($secretNumber < $userNumber) {
echo '<h1 style="color:blue">Your number is too BIG.</h1>';
} else {
echo '<h1 style="color:green">You win the game.</h1>';
}
}

?> 

<form method="POST" action="">
    Enter Number: <input name="userNumber" type="text">
    <button type="submit">Check</button>
</form> 

</body>
</html>