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![](https://ecs-static.teamtreehouse.com/assets/views/marketing/shared/community-banner-white-47072046c51352fe6a69f5e691ff5700b28bb11d45197d7bdf066d9ea3f72d0c.webp)
![Owa Aquino](https://uploads.teamtreehouse.com/production/profile-photos/5076662/micro_IMG_3772.jpg)
Owa Aquino
19,277 PointsNeed help on this Code Challenge for PHP Basic.
Hello,
It just kept saying that "Your foreach statement needs to assign the array keys to a temporary variable named $isbn."
My answer was :
<?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 $book => $item) {
$isbn = array_keys($books);
?>
<li><?php echo $book; ?></li>
<?php } ?>
</ul>
</body>
</html>
Don't really quite understand the array keys.
Thanks in advance!
1 Answer
![Luke Pettway](https://secure.gravatar.com/avatar/f6f35162320dd32e6a5704d9b02232e0?s=96&d=https%3A%2F%2Fecs-static.teamtreehouse.com%2Fassets%2Fcontent%2Fdefault_avatar-445fbbabfc8dc9188fb5967fe43322ee0c3e0dd1e10f378bf8343784af5a13eb.webp&r=pg)
Luke Pettway
16,593 PointsIn your foreach you need to set up the temporary assignment there like this:
<?php foreach($books as $isbn => $book) {
array_keys()
gets the values of all the keys in the entire array: