How to change the order an rss feed is displayed

PHP
1

I’m setting up an rss feed amalgamator on a site and I’ve found this great code which I’ve tweaked to suit the site.

Here’s the code below which works fine but the problem I’ve got is that I can’t work out how to get the posts to display based on date order or how to limit the number of posts pulled in from each feed.

Any help with this would be greatly appreciated.

<?php

class Feed_Amalgamator
{
    public $urls = array();
    public $data = array();

    public function addFeeds( array $feeds )
    {
        $this->urls = array_merge( $this->urls, array_values($feeds) );
    }

    public function grabRss()
    {
        foreach ( $this->urls as $feed )
        {
            $data = @new SimpleXMLElement( $feed, 0, true );
            if ( !$data )
                throw new Exception( 'Could not load: ' . $feed );
            foreach ( $data->channel->item as $item )
            {
                $this->data[] = $item;
            }
        }
    }

    public function amalgamate()
    {
        shuffle( $this->data );
        $temp = array();
        foreach ( $this->data as $item )
        {
            if ( !in_array($item->link, $this->links($temp)) )
            {
                $temp[] = $item;
            }
        }
        $this->data = $temp;
        shuffle( $this->data );
    }

    private function links( array $items )
    {
        $links = array();
        foreach ( $items as $item )
        {
            $links[] = $item->link;
        }
        return $links;
    }
}

/********* Example *********/

$urls = array( 'http://news.sky.com/feeds/rss/technology.xml', 'http://en.nauticwebnews.com/feed/', 'http://en.nauticwebnews.com/category/companies/events-companies/feed/', 'http://www.cobham.com/rss.aspx');

try
{
    $feeds = new Feed_Amalgamator;
    $feeds->addFeeds( $urls );
    $feeds->grabRss();
    $feeds->amalgamate();
}
catch ( exception $e )
{
    die( $e->getMessage() );
}

foreach ( $feeds->data as $item ) :
extract( (array) $item );

$Mydate = strtotime($pubDate);
$day = date('m', $Mydate);
$month = date('M', $Mydate);
?>
<div class="entry clearfix">
    <div class="entry_c">
    <div class="entry_date">
    <div class="day"><?php echo $day; ?></div>
    <div class="month"><?php echo $month; ?></div>
    </div>
    <div class="entry_title"><h2><a href="<?php echo $link; ?>"><?php echo $title; ?></a></h2></div>

    <div class="clear"></div>
    <span class="page-divider"></span>
    <div class="entry_content">
    <?php echo $description; ?>
    </div>
    </div>
    </div>
<?php endforeach; ?>