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 Build a Basic PHP Website (2018) Listing and Sorting Inventory Items Array Keys

Build Basic PHP Website - Coding Challenge - Task 2 - ISBN and Book Titles

Can't quite understand why my code generates such error, can someone please check it out, because it does seem logical to me, unless i have not seen or done something important.

index.php
<?php

$books["978-0743261690"] = "Gilgamesh";
$books["978-0060931957"] = "The Odyssey";
$books["978-0192840509"] = "Aesop's Fables";
$books["978-0520227040"] = "Mahabharta";
$books["978-0393320978"] = "Beowulf";

?><html>
<head>
    <title>Five Great Books</title>
</head>
<body>
    <h1>Five Great Books</h1>
    <ul>
        <?php foreach($books as $isbn=>$book) { ?>
            <li><?php echo $book[$isbn];?>
                <?php echo " (".$isbn.")";?></li>
        <?php } ?>
    </ul>
</body>
</html>
Antonio De Rose
Antonio De Rose
20,884 Points
<?php echo $book[$isbn];?>
this line above is where the issue is from, what you are trying to do is take the string $book, and then treating as an array, it has to be like

<?php echo $books[$isbn];?>

or else you could even easily do the 2 lines you put,  in one line like

<?php echo $book." (".$isbn.")"; ?>