Tyler's Radius form

CODE FOLLOWS

<?php

    include('../includes/header.php');

    // code
    error_reporting(E_ALL);    // set error reporting to all

    echo('<h1>Tyler\'s Radius form</h1>');

    // Note the variables being passed via the POST ternary operators.

    $step = isset($_POST['step']) ? $_POST['step'] : 0;
    $radius = isset($_POST['radius']) ? $_POST['radius'] : '';

    // filter all input taken from the Browser
    $step = htmlentities($step);
    $radius = htmlentities($radius);

    if ($step == 0)    // first time into this form
    {
        ?>

        <form action="week-4-users-value.php" method="POST">
            <label for="name">Radius</label>
            <input type="text" size="36" id="name" name="radius" value="">
            <br><br>
            <input type="hidden" name="step" value="1">
            <input type="submit" name="submit" value="Submit">
        </form>

        <?php
    } else  // else show what the form gathered
    {

        echo('<p>The following is what the form gathered</p>');
        echo('<p>Please note: The POST array has not been scrubbed</p>');
        echo('<p>Thus, it is open to javascript insertion.</p>');
        echo('<pre>');
        print_r($_POST);    // note this dumps the entire contents of the $_POST array
        echo('</pre>');

        $diameter = $radius * 2;

        echo("<h3>Diameter = $diameter</h3>");

        // provide a form to try again
        ?>

        <form action="week-4-users-value.php" method="POST">
            <input type="hidden" name="step" value="0">
            <input type="submit" name="submit" value="Try Again">
        </form>

        <?php
    }

    include('../includes/footer.php');
?>
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