<?php
// (c) Tobias Bambullis, streamfirma.de
function get_icecast_info($server_ip, $server_port, $admin_user, $admin_password) {
  $index = @file_get_contents("http://".$admin_user.":".$admin_password."@".
                              $server_ip.":".$server_port."/admin/stats.xml");

  if($index) {
    $xml = new DOMDocument();
    if(!$xml->loadXML($index)) return false;
    $arr = array();
    $listItem = $xml->getElementsByTagName("source");
    foreach($listItem as $element) {
        if($element->childNodes->length) {
            foreach($element->childNodes as $i) {
                $arr[$element->getAttribute("mount")][$i->nodeName] = $i->nodeValue;
            }
        }
    }
    return $arr;
  } return false;
}

$arr = get_icecast_info("sf1.streamfirma.de", "1502", "admin_user", "admin_password");
foreach($arr as $mount => $stats) echo "Auf dem Mountpoint ".$mount." befinden sich ".$stats["listeners"]." Listener!<br />";
?>

Array
(
    [/live.ogg] => Array
        (
            [artist] => Laurent Wolf
            [audio_bitrate] => 112001
            [audio_channels] => 2
            [audio_info] => samplerate=0;channels=0;quality=3%2e00
            [audio_samplerate] => 44100
            [channels] => 0
            [genre] => Various
            [ice-bitrate] => 112
            [listener_peak] => 0
            [listeners] => 0
            [listenurl] => http://localhost:1502/live.ogg
            [max_listeners] => unlimited
            [public] => 1
            [quality] => 3.00
            [samplerate] => 0
            [server_description] => Streamfirma Demo Account Auto DJ
            [server_name] => Streamfirma Demo Account Auto DJ
            [server_type] => application/ogg
            [server_url] => http://streamfirma.de
            [slow_listeners] => 0
            [source_ip] => 127.0.0.1
            [stream_start] => Wed, 12 May 2010 14:09:14 +0200
            [subtype] => Vorbis
            [title] => Walk The Line
            [total_bytes_read] => 142131954
            [total_bytes_sent] => 0
            [user_agent] => IceS 2.0.1
            [yp_currently_playing] => Laurent Wolf - Walk The Line
        )

)