source feeds
{
type = xmlpipe2
xmlpipe_command = /usr/bin/php /path/to/webroot/feeds/makeindex.php
xmlpipe_field = title
xmlpipe_field = description
xmlpipe_field = author
xmlpipe_attr_timestamp = pub_date
xmlpipe_attr_multi = category_id
}
index feed-items
{
source = feeds
path = /usr/local/sphinx/var/data/feed-items
charset_type = utf-8
}
indexer
{
mem_limit = 64M
}

<?php
require('init.php');
require('simplepie.inc');
// Instantiate the simplepie class
// We will use simplepie to parse the feed xml
$feed = new SimplePie();
// We don't want to cache feed items
$feed->enable_cache(false);
$feed->set_timeout(30);
// We will use PHP's inbuilt XMLWriter to create the xml structure
$xmlwriter = new XMLWriter();
$xmlwriter->openMemory();...