Daily Calorie Needs Calculator

CODE FOLLOWS

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

error_reporting(E_ALL);

echo('<h1>Daily Calorie Needs Calculator</h1>');

// variables passed via POST
$step = isset($_POST['step']) ? $_POST['step'] : 0;
$weight = isset($_POST['weight']) ? $_POST['weight'] : '';
$height = isset($_POST['height']) ? $_POST['height'] : '';
$age = isset($_POST['age']) ? $_POST['age'] : '';
$activity = isset($_POST['activity']) ? $_POST['activity'] : '';

// sanitize input
$step = htmlentities($step);
$weight = htmlentities($weight);
$height = htmlentities($height);
$age = htmlentities($age);
$activity = htmlentities($activity);

if ($step == 0) {
    // display form
    ?>

    <form method="POST" class="pad">
        <label for="weight">Weight (lbs):</label>
        <input type="text" id="weight" name="weight" value="">
        <br><br>

        <label for="height">Height (inches):</label>
        <input type="text" id="height" name="height" value="">
        <br><br>

        <label for="age">Age (years):</label>
        <input type="text" id="age" name="age" value="">
        <br><br>

        <label for="activity">Activity Level:</label>
        <select id="activity" name="activity">
            <option value="1.2">Sedentary</option>
            <option value="1.375">Lightly active</option>
            <option value="1.55">Moderately active</option>
            <option value="1.725">Very active</option>
            <option value="1.9">Extra active</option>
        </select>
        <br><br>

        <input type="hidden" name="step" value="1">
        <input type="submit" name="submit" value="Calculate Calories">
    </form>

    <?php
} else {
    // show results
    echo('<p>The following is what the form gathered:</p>');
    echo('<pre>');
    print_r($_POST);
    echo('</pre>');

    if ($weight > 0 && $height > 0 && $age > 0 && $activity > 0) {
        // Basic Mifflin-St Jeor Equation for Men (you can also add a gender field)
        $bmr = (10 * ($weight * 0.453592)) + (6.25 * ($height * 2.54)) - (5 * $age) + 5; // weight in kg, height in cm
        $calories = round($bmr * $activity);

        echo("<h3>Estimated Daily Calories: $calories kcal</h3>");
    } else {
        echo('<p>Invalid input provided.</p>');
    }

    // try again form
    ?>

    <form 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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