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Allie's Cylinder volume form

CODE FOLLOWS

<?php



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



// code

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



echo('<h1>Allie\'s Cylinder volume 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'] : '';

$height = isset($_POST['height']) ? $_POST['height'] : '';



// filter all input taken from the Browser

$step = htmlentities($step);

$radius = htmlentities($radius);

$height = htmlentities($height);



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

{

    ?>



    <form action="my-week-4-example.php" method="POST">

        <label for="radius">Radius</label>

        <input type="text" size="36" id="radius" name="radius" value="">

        <br><br>

        <label for="height">Height</label>

        <input type="text" size="36" id="height" name="height" 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('<pre>');

    print_r($_POST);    // note this dumps the entire contents of the $_POST array

    echo('</pre>');



    $volume = M_PI * pow($radius, 2) * $height;



    echo("<h3>Volume = $volume</h3>");



    // provide a form to try again

    ?>



    <form action="my-week-4-example.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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