<?php
include('../includes/header.php');
// code
error_reporting(E_ALL); // set error reporting to all
echo('<h1>Calculate average form</h1>');
$step = isset($_POST['step']) ? $_POST['step'] : 0;
// filter all input taken from the Browser
$step = htmlentities($step);
if ($step == 0) // first time into this form
{
?>
<form action="average.php" method="POST">
<label for="num1">Number 1</label>
<input type="text" size="36" id="num1" name="num1" value="">
<br><br>
<label for="name">Number 2</label>
<input type="text" size="36" id="num2" name="num2" value="">
<br><br>
<label for="num3">Number 3</label>
<input type="text" size="36" id="num3" name="num3" value="">
<br><br>
<input type="hidden" name="step" value="-1">
<input type="submit" name="submit" value="Submit">
</form>
<?php
} else // else show the average
{
$total = 0;
$average = 0;
$counter = 0;
$message = "The average of the ";
$message2 = "";
// iterate over the items in the post array
foreach ($_POST as $num) {
$float = floatval(htmlentities($num));
// if current num it not one and is a float
if ($float != -1 && floatval($num)) {
$total += $float;
$counter++;
// gather numbers used for calculations in a string for output message
$message2 .= $num . " ";
}
}
// concatenate numbers to the output message
$message .= $counter . " ";
// clause to make sure not dividing by zero when no input is given
if ($counter > 0) {
$average = $total / $counter;
// output message
echo("<h3>$message numbers $message2 is equal to $average</h3>");
}
// provide a form to try again
?>
<form action="average.php" method="POST">
<input type="hidden" name="step" value="0">
<input type="submit" name="submit" value="Try Again">
</form>
<?php
}
include('../includes/footer.php');
?>