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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
20,877 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.")"; ?>