ramsey/generate-opml.php

## generate-opml.php
#!/usr/local/bin/php
<?php
include_once('getRSSLocation.php');

// del.icio.us username and password
$username   = 'your_username';
$password   = 'your_password';

$cache_file = '/tmp/delicious-blogroll.xml';
$blogs      = array();


// STEP ONE: CACHE DEL.ICIO.US DATA

// determine whether an update has been made to del.icio.us since the
// last update; if so, then grab the results from del.icio.us and cache them

$update = simplexml_load_file("https://{$username}:{$password}@api.del.icio.us/v1/posts/update");

if (strtotime($update['time']) > filemtime($cache_file))
{
    // del.icio.us has been updated since last cache; recache
    $data = file_get_contents("https://{$username}:{$password}@api.del.icio.us/v1/posts/all?tag=blogroll");
    file_put_contents($cache_file, $data);
}
else
{
    // if there have been no updates, then exit
    exit;
}


// STEP TWO: READ CACHED DATA

$blogroll = simplexml_load_file($cache_file);
foreach ($blogroll->post as $post)
{
    $blogs[] = array(
        'name' => $post['description'],
        'href' => $post['href']
    );
}

// sort by name
$name = array();
foreach ($blogs as $k => $v)
{
    $name[$k] = $v['name'];
}
array_multisort($name, SORT_ASC, $blogs);


// STEP THREE: GENERATE OPML

// start buffering output
ob_start();

echo '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
?>
<opml version="1.0">
    <head>
        <title>PHP Blogroll</title>
        <expansionState/>
    </head>
    <body>
        <outline text="php">
<?php
foreach ($blogs as $blog)
{
    $html = file_get_contents($blog['href']);
    if ($html !== FALSE)
    {
        // discover the blog's RSS feed
        $xmlUrl = getRSSLocation($html, $blog['href']);

        echo '            '; // line things up cleanly in output
        echo '<outline ';
        echo 'text="' . htmlentities($blog['name']) . '" ';
        echo 'htmlUrl="' . htmlentities($blog['href']) . '" ';
        echo 'title="' . htmlentities($blog['name']) . '"';
        if ($xmlUrl)
        {
            echo ' type="rss"';
            echo ' xmlUrl="' . htmlentities($xmlUrl) . '"';
        }
        echo "/>\n";
    }
}
?>
        </outline>
    </body>
</opml>
<?php
// get OPML from buffer and save to file
$opml = ob_get_clean();
file_put_contents('/path/to/blogroll.opml', $opml);
?>

## getRSSLocation.php
<?php
/**
 * This is a cleaned up and modified version of Keith Deven's getRSSLocation()
 * function, which can be found at:
 * http://keithdevens.com/weblog/archive/2002/Jun/03/RSSAuto-DiscoveryPHP
 *
 * Cleaned up by Ben Ramsey, http://benramsey.com
 */

function getRSSLocation($html, $location)
{
    if (!$html || !$location)
    {
        return FALSE;
    }
    else
    {
        // search through the HTML, save all <link> tags
        // and store each link's attributes in an associative array
        preg_match_all('/<link\s+(.*?)\s*\/?>/si', $html, $matches);
        $links = $matches[1];
        $final_links = array();

        foreach ($links as $link)
        {
            $attributes = preg_split('/\s+/s', $link);
            foreach ($attributes as $attribute)
            {
                $att = preg_split('/\s*=\s*/s', $attribute, 2);
                if (isset($att[1]))
                {
                    $att[1] = preg_replace('/([\'"]?)(.*)\1/', '$2', $att[1]);
                    $final_link[strtolower($att[0])] = $att[1];
                }
            }
            $final_links[] = $final_link;
        }

        // now figure out which one points to the RSS file
        foreach ($final_links as $link)
        {
            $href = FALSE;

            if (strcasecmp($link['rel'], 'alternate') == 0)
            {

                switch (strtolower($link['type']))
                {
                    case 'application/rss+xml':
                    case 'application/atom+xml':
                    case 'text/xml':
                        $href = $link['href'];
                        break;
                    default:
                        $href = FALSE;
                        break;
                }

                if ($href)
                {
                    if (strpos($href, "http://") === 0)
                    {
                        // absolute URL
                        $full_url = $href;
                    }
                    else
                    {
                        // otherwise, 'absolutize' it
                        $url_parts = parse_url($location);

                        // only made it work for http:// links
                        $full_url = "http://{$url_parts['host']}";

                        if (isset($url_parts['port']))
                        {
                            $full_url .= ":{$url_parts[port]}";
                        }

                        if (strpos($href, '/') !== 0)
                        {
                            // it's a relative link on the path
                            $full_url .= dirname($url_parts['path']);
                            if (substr($full_url, -1) != '/')
                            {
                                // if the last character isn't a '/', add it
                                $full_url .= '/';
                            }
                        }

                        $full_url .= $href;
                    }
                    return $full_url;
                }
            }
        }
        return FALSE;
    }
}
?>
	#!/usr/local/bin/php
	<?php
	include_once('getRSSLocation.php');

	// del.icio.us username and password
	$username = 'your_username';
	$password = 'your_password';

	$cache_file = '/tmp/delicious-blogroll.xml';
	$blogs = array();


	// STEP ONE: CACHE DEL.ICIO.US DATA

	// determine whether an update has been made to del.icio.us since the
	// last update; if so, then grab the results from del.icio.us and cache them

	$update = simplexml_load_file("https://{$username}:{$password}@api.del.icio.us/v1/posts/update");

	if (strtotime($update['time']) > filemtime($cache_file))
	{
	// del.icio.us has been updated since last cache; recache
	$data = file_get_contents("https://{$username}:{$password}@api.del.icio.us/v1/posts/all?tag=blogroll");
	file_put_contents($cache_file, $data);
	}
	else
	{
	// if there have been no updates, then exit
	exit;
	}


	// STEP TWO: READ CACHED DATA

	$blogroll = simplexml_load_file($cache_file);
	foreach ($blogroll->post as $post)
	{
	$blogs[] = array(
	'name' => $post['description'],
	'href' => $post['href']
	);
	}

	// sort by name
	$name = array();
	foreach ($blogs as $k => $v)
	{
	$name[$k] = $v['name'];
	}
	array_multisort($name, SORT_ASC, $blogs);


	// STEP THREE: GENERATE OPML

	// start buffering output
	ob_start();

	echo '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
	?>
	<opml version="1.0">
	<head>
	<title>PHP Blogroll</title>
	<expansionState/>
	</head>
	<body>
	<outline text="php">
	<?php
	foreach ($blogs as $blog)
	{
	$html = file_get_contents($blog['href']);
	if ($html !== FALSE)
	{
	// discover the blog's RSS feed
	$xmlUrl = getRSSLocation($html, $blog['href']);

	echo ' '; // line things up cleanly in output
	echo '<outline ';
	echo 'text="' . htmlentities($blog['name']) . '" ';
	echo 'htmlUrl="' . htmlentities($blog['href']) . '" ';
	echo 'title="' . htmlentities($blog['name']) . '"';
	if ($xmlUrl)
	{
	echo ' type="rss"';
	echo ' xmlUrl="' . htmlentities($xmlUrl) . '"';
	}
	echo "/>\n";
	}
	}
	?>
	</outline>
	</body>
	</opml>
	<?php
	// get OPML from buffer and save to file
	$opml = ob_get_clean();
	file_put_contents('/path/to/blogroll.opml', $opml);
	?>
	<?php
	/**
	* This is a cleaned up and modified version of Keith Deven's getRSSLocation()
	* function, which can be found at:
	* http://keithdevens.com/weblog/archive/2002/Jun/03/RSSAuto-DiscoveryPHP
	*
	* Cleaned up by Ben Ramsey, http://benramsey.com
	*/

	function getRSSLocation($html, $location)
	{
	if (!$html \|\| !$location)
	{
	return FALSE;
	}
	else
	{
	// search through the HTML, save all <link> tags
	// and store each link's attributes in an associative array
	preg_match_all('/<link\s+(.?)\s\/?>/si', $html, $matches);
	$links = $matches[1];
	$final_links = array();

	foreach ($links as $link)
	{
	$attributes = preg_split('/\s+/s', $link);
	foreach ($attributes as $attribute)
	{
	$att = preg_split('/\s=\s/s', $attribute, 2);
	if (isset($att[1]))
	{
	$att[1] = preg_replace('/([\'"]?)(.*)\1/', '$2', $att[1]);
	$final_link[strtolower($att[0])] = $att[1];
	}
	}
	$final_links[] = $final_link;
	}

	// now figure out which one points to the RSS file
	foreach ($final_links as $link)
	{
	$href = FALSE;

	if (strcasecmp($link['rel'], 'alternate') == 0)
	{

	switch (strtolower($link['type']))
	{
	case 'application/rss+xml':
	case 'application/atom+xml':
	case 'text/xml':
	$href = $link['href'];
	break;
	default:
	$href = FALSE;
	break;
	}

	if ($href)
	{
	if (strpos($href, "http://") === 0)
	{
	// absolute URL
	$full_url = $href;
	}
	else
	{
	// otherwise, 'absolutize' it
	$url_parts = parse_url($location);

	// only made it work for http:// links
	$full_url = "http://{$url_parts['host']}";

	if (isset($url_parts['port']))
	{
	$full_url .= ":{$url_parts[port]}";
	}

	if (strpos($href, '/') !== 0)
	{
	// it's a relative link on the path
	$full_url .= dirname($url_parts['path']);
	if (substr($full_url, -1) != '/')
	{
	// if the last character isn't a '/', add it
	$full_url .= '/';
	}
	}

	$full_url .= $href;
	}
	return $full_url;
	}
	}
	}
	return FALSE;
	}
	}
	?>