hi, I am having a problem generating output for this code :
                [
                    'name' => 'Project Hail Merry',
                    'author'=> 'Andy Weir',
                    'releaseYear' => 2021,
                    'purchaseUrl' => 'https://example.com',
                ],
                
                [

                    'name' => 'The Martian',
                    'author'=> 'Andy Weir',
                    'releaseYear' => 2011,
                    'purchaseUrl' => 'https://example.com',
                ],

            ];
            
    
            function filterByAuthor($books, $author) {
                $filteredBooks = [];
            
                foreach ($books as $book) {
                    if ($book['author'] = $author) {
                        $filteredBooks[] = $book;
                    }
                }
            
                return $filteredBooks;
            }
            
           
            
         ?>

        <ul>
            <?php foreach ($filterByAuthor($books, 'Andy Weir') as $book) : ?>
                    <li>
                        <a href="<?= $book['purchaseUrl'] ?>">
                            <?= $book['name']; ?> (<?= $book['releaseYear'] ?>)-BY <?= $book['author'] ?>
                        </a>
                    </li>
            
            <?php endforeach; ?>

        </ul>
    

</body>
Functions and Filters
