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

Modify the page to display each book's ISBN.

The array below contains a list of books. Each element in the array has the book's ISBN as its key and the book's title as its value. Right now, the page is only displaying the book titles in the browser. In this code challenge, we will modify the page to also display each book's ISBN.

First, we need to make the keys from the $books array accessible inside the foreach loop. Modify the foreach command so that, as it loops through the books, it loads the ISBN for each book into a working variable called $isbn. At the same time, it should continue loading the title of each book into the $book variable.


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

    <title>Five Great Books</title>
    <h1>Five Great Books</h1>
        <?php foreach($books as $book) { ?>
            <li><?php echo $book; ?></li>
        <?php } ?>

1 Answer

Jennifer Nordell
Jennifer Nordell
Treehouse Teacher

I wish I knew what you'd tried before that's failing. I feel like it'd be a better learning experience for you if we could say where exactly you're going wrong. But here's my code snippet:

        <?php foreach($books as $isbn => $book) { ?>
            <li><?php echo $book; ?></li>
        <?php } ?>

This will read in the key of the book which corresponds to the ISBN number. Hope this helps! :sparkles: