lastfmtwitter.php

<?php
  require_once('TwitterAPIExchange.php');
  function getLastPlayedSong($username, $apiKey) {
        $url = "http://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=" . $username .
        "&api_key=" . $apiKey ."&format=json";
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $rawData = curl_exec($ch);
        curl_close($ch);
        if(!$rawData){
            return "";
        }
        $data = json_decode($rawData);
        $recenttracks = $data->recenttracks;

        $track = $recenttracks->track[0];
        $artistData = $track->artist;
        $artist = $artistData->{'#text'};
        $track = $track->name;

        return "$artist - $track";
  }



  $settings = array(
      'oauth_access_token' => "", // Get this from your twitter app. it's the one under 'Your Access Token'
      'oauth_access_token_secret' => "",
      'consumer_key' => "", // also get this from your twitter app
      'consumer_secret' => "",
      'lastfm_username' => "YOUR LASTFM USERNAME",
      'lastfm_apikey' => '' // create a last.fm app https://www.last.fm/api/account/create
  );

  $url = 'https://api.twitter.com/1.1/account/update_profile.json';
  $requestMethod = 'POST';


  $songname = getLastPlayedSong($settings["lastfm_username"], $settings["lastfm_apikey"]);

  $postfields = array(
    'name' => 'YOUR USERNAME' . $songname, // 50
  );

  $twitter = new TwitterAPIExchange($settings);
echo $twitter->buildOauth($url, $requestMethod)
    ->setPostfields($postfields)
    ->performRequest();