<?php
include('includes/header.php');
// code
error_reporting(E_ALL); // set error reporting to all
echo('<h1>Orlando\'s Gravity form</h1>');
// Note the variables being passed via the POST ternary operators.
$step = isset($_POST['step']) ? $_POST['step'] : 0;
$gravity = 9.8;
$height = isset($_POST['height']) ? $_POST['height'] : '';
// filter all input taken from the Browser
$step = htmlentities($step);
$height = htmlentities($height);
if ($step == 0) // first time into this form
{
?>
<form action="Gravity.php" method="POST">
<label for="name">Enter Object Height: </label>
<input type="text" size="36" id="name" name="height" value="">
<br><br>
<input type="hidden" name="step" value="1">
<input type="submit" name="submit" value="Submit">
</form>
<?php
} else // else show what the form gathered
{
echo('<p>The following is what the form gathered</p>');
echo('<p>Please note: The POST array has not been scrubbed</p>');
echo('<p>Thus, it is open to javascript insertion.</p>');
echo('<pre>');
print_r($_POST); // note this dumps the entire contents of the $_POST array
echo('</pre>');
$impact = round(sqrt((2*$height)/$gravity),3);
echo("<h3>In an airless environment, if you dropped an object at $height meters,<br> it would hit the ground in $impact seconds.</h3>");
// provide a form to try again
?>
<form action="Gravity.php" method="POST">
<input type="hidden" name="step" value="0">
<input type="submit" name="submit" value="Try Again">
</form>
<?php
}
include('includes/footer.php');
?>