Sort Feeds By Relevance

ojsimon · March 2, 2008

Hi

I Am using Simplepie to display some rss feeds, currently it displays them in date and time order but i want it to display them in relevance order by using a usort function.

here is the code for the page

<?php 
/******************************************************************** 
MULTIFEEDS TEST PAGE 

Nothing too exciting here.  Just a sample page that demos integrated  
Multifeeds support as well as cached favicons and perhaps a few other  
things. 

Lots of this code is commented to help explain some of the new stuff.   
Code was tested in PHP 5.2.2, but *should* also work with earlier  
versions of PHP, as supported by SimplePie (PHP 4.1). 

********************************************************************/ 

// Include the SimplePie library, and the one that handles internationalized domain names. 
require_once('../simplepie.inc'); 
require_once('../idn/idna_convert.class.php'); 

// Initialize some feeds for use. 
$feed = new SimplePie(); 
$feed->set_feed_url(array( 
    'http://rss.news.yahoo.com/rss/topstories', 
    'http://news.google.com/?output=atom', 
    'http://rss.cnn.com/rss/cnn_topstories.rss' 
)); 

// When we set these, we need to make sure that the handler_image.php file is also trying to read from the same cache directory that we are. 
$feed->set_favicon_handler('./handler_image.php'); 
$feed->set_image_handler('./handler_image.php'); 

// Initialize the feed. 
$feed->init(); 



// Make sure the page is being served with the UTF-8 headers. 
$feed->handle_content_type(); 



// Begin the (X)HTML page. 
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">     
<head> 
    <title>Multifeeds Test page</title> 
    <link rel="stylesheet" href="../demo/for_the_demo/simplepie.css" type="text/css" media="screen" title="SimplePie Styles" charset="utf-8" /> 
    <style type="text/css"> 
    div#site { 
        width:600px; 
    } 
    span.footnote { 
        white-space:nowrap; 
    } 
    h1 { 
        line-height:1.4em; 
    } 
    h4 { 
        padding-left:20px; 
        background-color:transparent; 
        background-repeat:no-repeat; 
        background-position:0 1px; 
    } 
    .clearBoth { 
        clear:both; 
    } 
    </style> 
</head> 
<body> 
<div id="site"> 

    <?php if ($feed->error): ?> 
        <p><?=$feed->error()?></p> 
    <?php endif ?> 

    <div class="chunk"> 
        <h1>Quick-n-Dirty Multifeeds Demo</a></h1> 
    </div> 

    <?php 
    // Let's loop through each item in the feed. 
    foreach($feed->get_items() as $item): 

    // Let's give ourselves a reference to the parent $feed object for this particular item. 
    $feed = $item->get_feed(); 
    ?> 

        <div class="chunk"> 
            <h4 style="background-image:url(<?php echo $feed->get_favicon(); ?>);"><a href="<?php echo $item->get_permalink(); ?>"><?php echo html_entity_decode($item->get_title(), ENT_QUOTES, 'UTF-8'); ?></a></h4> 

            <!-- get_content() prefers full content over summaries --> 
            <?php echo $item->get_content(); ?> 

            <?php if ($enclosure = $item->get_enclosure()): ?> 
                <div> 
                <?php echo $enclosure->native_embed(array( 
                    // New 'mediaplayer' attribute shows off Flash-based MP3 and FLV playback. 
                    'mediaplayer' => '../demo/for_the_demo/mediaplayer.swf' 
                )); ?> 
                </div> 
            <?php endif; ?> 

            <p class="footnote">Source: <a href="<?php echo $feed->get_permalink(); ?>"><?php echo $feed->get_title(); ?></a> | <?php echo $item->get_date('j M Y | g:i a'); ?></p> 
        </div> 

    <?php endforeach ?> 

    <p class="footnote">This is a test of the emergency broadcast system.  This is only a test… beeeeeeeeeeeeeeeeeeeeeeeeeep!</p> 

</div> 
</body> 
</html>

This is the sort of usort i will use

usort($feed,'funnySort'); 

function funnySort($a,$b) 
{ 
    // assign numerical value so we can sort on  
        // whether "term" is in title or content or neither 

    $term = 'funny'; 

    $x = 0;     
    if (stripos($a->get_title(),$term)) 
        $x = 2; 
    elseif (stripos($a->get_content(),$term)) 
        $x = 1; 

    $y = 0;     
    if (stripos($b->get_title(),$term)) 
        $y = 2; 
    elseif (stripos($b->get_content(),$term)) 
        $y = 1; 

    return $x <= $y 
}

How can i make this work together so that it displays the most relevant posts first?

Thanks

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