Turn mixcloud streams into an RSS feed e.g. for mixcloud.com/<mixcloudstream>/playlists/<streamplaylist-if-there-is-one>/ go to mysite.com/mixcloud-rssifier/?fname=<mixcloudstream>&lname=<streamplaylist-if-there-is-one> to get an RSS feed of the stream or the playlist from the stream

Mixcloud RSSifier

<?php
header('Content-Type: application/rss+xml; charset=UTF-8');

// suck in the query string variables
$feed_name = htmlspecialchars($_GET['fname']);
$list_name = htmlspecialchars($_GET['lname']);

// compose the api urls + other stuff depending on presence of playlist
if(isset($_GET['lname'])) {
        $json_url = 'http://api.mixcloud.com/'.$feed_name.'/playlists/'.$list_name.'/cloudcasts/';
        $mcloud_url = 'https://www.mixcloud.com/'.$feed_name.'/playlists/'.$list_name.'/';
        $feed_title = $feed_name.': '.$list_name;
} else {
        $json_url = 'http://api.mixcloud.com/'.$feed_name.'/cloudcasts/';
        $mcloud_url = 'https://www.mixcloud.com/'.$feed_name.'/';
        $feed_title = $feed_name;
}

// suck in json from mixcloud and turn into an array
$json = file_get_contents($json_url);
$feed_array = json_decode($json, true);

?>
<?xml version="1.0" encoding="utf-8"?>
<rss version='2.0'>

<channel>
        <title><?php echo $feed_array[name]; ?></title>
        <link><?php echo $mcloud_url; ?></link>
        <description><?php echo 'RSS feed for '.$feed_title.' on mixcloud.com'; ?></description>
        <image>
                <title><?php echo $feed_array[name]; ?></title>
                <url><?php echo $feed_array[data][0][user][pictures][large]; ?></url>
                <link><?php echo $mcloud_url; ?></link>
        </image>

<?php
// item loop stuff goes here
foreach ($feed_array[data] as $feed_item) {
        echo "<item>\n";
                echo "<title>";
                echo htmlentities($feed_item[name]);
                echo "</title>\n";

                echo "<link>";
                echo $feed_item[url];
                echo "</link>\n";

                echo "<description>";
                echo '<![CDATA[<img src="'.$feed_item[pictures][extra_large].'">]]>';
                echo "</description>\n";

                echo "<pubDate>";
                $ptime = new DateTime($feed_item[created_time]);
                echo $ptime->format('r');
                echo "</pubDate>\n";
        echo "</item>\n";
}

?>

</channel>
</rss>

I had to enclose each of the array address strings in double brackets for it to succeed.

i.e. $feed_array[name] became $feed_array["name"]