我想从奇数,甚至从下面的XML与PHP交替行颜色。交替行颜色从XML数据源与PHP的HTML表格
<?php
// load SimpleXML
$books = new SimpleXMLElement('books.xml', null, true);
echo <<<EOF
<table>
<tr>
<th>Title</th>
<th>Author</th>
<th>Publisher</th>
<th>Price at Amazon.com</th>
<th>ISBN</th>
</tr>
EOF;
foreach($books as $book) // loop through our books
{
echo <<<EOF
<tr>
<td>{$book->title}</td>
<td>{$book->author}</td>
<td>{$book->publisher}</td>
<td>\${$book->amazon_price}</td>
<td>{$book['isbn']}</td>
</tr>
EOF;
}
echo '</table>';
?>
我该怎么做这个与PHP考虑到我的来源是XML?