Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

PHP

A R
A R
12,834 Points
Posted by A R
A R
12,834 Points

Variable/Input Type issue

I'm not sure exactly what's going wrong here but trying to POST the question number isn't working. It seems like the values I'm getting when I try and post aren't integers, but I'm not sure why. Thanks in advance for any help!

<?php 
    include('inc/quiz.php');
    session_start();
     ?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Math Quiz: Addition</title>
    <link href='https://fonts.googleapis.com/css?family=Playfair+Display:400,400italic,700,700italic' rel='stylesheet' type='text/css'>
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/styles.css">
</head>
<body>
<?php 
    if (isset($_POST['page'])){
/// yes, I know I should sanitize the input, I was just trying different things to figure this out.
        $q_num = (int)$_POST['page'];
    } else {
    $q_num = 1;
 }
$num_of_q = 10;

?>
<?php var_dump($q_num);?>
    <div class="container">
        <div id="quiz-box">
            <p class="breadcrumbs">Question #<?= $q_num?> of <?= $num_of_q?></p>
            <p class="quiz">What is <?php 
            ?> </p>
            <form action="index.php" method="POST">
                <input type="hidden" name="page" value="<?php ($q_num+1);?>" />
                <input type="submit" class="btn" name="answer" value="135" />
                <input type="submit" class="btn" name="answer" value="125" />
                <input type="submit" class="btn" name="answer" value="115" />
            </form>
        </div>
    </div>
</body>
</html>

1 Answer

nathanl
nathanl
9,458 Points
nathanl
nathanl
9,458 Points

Based on the code provided, I would expect $q_num to be int(1) when the page is first loaded. After submitting the form, I would expect it to be int(0).

This is because nothing is being done with the result of ($q_num+1). If you want to use the result of this operation, then you'll need to echo it out. You can do this by changing the line with <?php ($q_num+1);?> to one of the following:

<input type="hidden" name="page" value="<?php echo ($q_num + 1); ?>" />

<input type="hidden" name="page" value="<?= ($q_num + 1) ?>" />