a beginner's question – php does not work

The purpose is to display RSS (e.g. BBC news) content on a wordpress page. I have put the following code into the short code box and test it. It gave me a ‘Error 500’

Maybe it is the path wrong.

Thank you for your help!

—————-

<?php
include_once(ABSPATH.’wp-content/plugins/rss.php’); // path to include script
$feed = fetch_rss(‘http://feeds.bbci.co.uk/news/rss.xml&#8217;); // specify feed url
$items = array_slice($feed->items, 0, 7); // specify first and last item
?>

<?php if (!empty($items)) : ?>
<?php foreach ($items as $item) : ?>

<h2>“><?php echo $item[‘title’]; ?></h2>
<p><?php echo $item[‘description’]; ?></p>

<?php endforeach; ?>
<?php endif; ?>

———–

http://wordpress.org/extend/plugins/shortcode-exec-php/