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

Dear, I pass the first challenge, but when I look at the preview my array_keys has generated an error

Dear

the first challenge I passed by

foreach($books as $isbn => $book) {echo $books; echo array_keys($isbn);}

however when looking at the preview I get an error saying parameter needs to be an array, so obviously the code was wrong yet I passed the challenge.

How do I get

a the keys to be displayed b where can I write $title

Best regards,

Mirko

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>
         <h1>Five Great Books</h1>
    <ul>
        <?php foreach($books as $isbn => $book) { ?>
            <li><?php echo $book; echo array_keys ($isbn); ?></li>
        <?php } ?>
    </ul>
</body>
</html>
    </ul>
</body>
</html>

2 Answers

Close, but you need to add in the parentheses using concatenation, and you only need one echo:

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

My gratitude for helping out a beginner, thank you!