Wordpress custom retweet and save buttons

functions.php

// Adds custom retweet and delicious buttons to Wordpress template
// Uses bit.ly, delicious, backtype, tweetmeme, and topsy APIs
// Adapted from Backtype Tweetcount plugin
// Nicolas Gallagher / @necolas

function tweet_save($url) {
  global $post;
  $url = '';
  $btype_cnt = null;
  $topsy_cnt = null;
  $tmeme_cnt = null;
  $cnt = null;

  // set cache interval
  $cache_interval = 60;

  // bit.ly API credentials
  $bitly_login = "YOURLOGIN";
  $bitly_key = "YOURAPIKEY";
      
  if (get_post_status($post->ID) == 'publish') {
    $url = get_permalink($post->post_id);
    $title = $post->post_title;
    
    if ((function_exists('curl_init') || function_exists('file_get_contents')) && function_exists('json_decode') && function_exists('unserialize')) {
      // shorten url
      if (get_post_meta($post->ID, 'bitly_short_url', true) == '') {
        $short_url = null;
        $short_url = shorten_bitly($url, $bitly_key, $bitly_login);
        if ($short_url) {
          add_post_meta($post->ID, 'bitly_short_url', $short_url);
        }
      }
      else {
        $short_url = get_post_meta($post->ID, 'bitly_short_url', true);
      }

      // backtype data
      $btype_meta = get_post_meta($post->ID, 'btype_cache', true);
      if ($btype_meta != '') {
        $btype_pieces = explode(':', $btype_meta);
        $btype_timestamp = (int)$btype_pieces[0];
        $btype_cnt = (int)$btype_pieces[1];
      }
      // expire backtype cache
      if ($btype_cnt === null || time() > $btype_timestamp + $cache_interval) {
        $btype_response = urlopen('http://backtweets.com/search.php?identifier=bttc&since_id=0&refresh=1&q=' . urlencode($url));
        $btype_data = unserialize($btype_response);
        if (isset($btype_data['results_count']) && (int)$btype_data['results_count'] >= $btype_cnt) {
          $btype_cnt = $btype_data['results_count'];
          if ($btype_meta == '') {
            add_post_meta($post->ID, 'btype_cache', time() . ':' . $btype_cnt);
          } else {
            update_post_meta($post->ID, 'btype_cache', time() . ':' . $btype_cnt);
          }
        }
      }
            
      // topsy data
      $topsy_meta = get_post_meta($post->ID, 'topsy_cache', true);
      if ($topsy_meta != '') {
        $topsy_pieces = explode(':', $topsy_meta);
        $topsy_timestamp = (int)$topsy_pieces[0];
        $topsy_cnt = (int)$topsy_pieces[1];
      }
      // expire topsy cache
      if ($topsy_cnt === null || time() > $topsy_timestamp + $cache_interval) {
        $topsy_response = urlopen('http://otter.topsy.com/stats.json?url=' . urlencode($url));
        $topsy_data = json_decode($topsy_response, true);
        if (isset($topsy_data['response']['all']) && (int)$topsy_data['response']['all'] >= $topsy_cnt) {
          $topsy_cnt = $topsy_data['response']['all'];
          if ($topsy_meta == '') {
            add_post_meta($post->ID, 'topsy_cache', time() . ':' . $topsy_cnt);
          } else {
            update_post_meta($post->ID, 'topsy_cache', time() . ':' . $topsy_cnt);
          }
        }
      }
            
      // tweetmeme data
      $tmeme_meta = get_post_meta($post->ID, 'tmeme_cache', true);
      if ($tmeme_meta != '') {
        $tmeme_pieces = explode(':', $tmeme_meta);
        $tmeme_timestamp = (int)$tmeme_pieces[0];
        $tmeme_cnt = (int)$tmeme_pieces[1];
      }
      // expire tweetmeme cache
      if ($tmeme_cnt === null || time() > $tmeme_timestamp + $cache_interval) {
        $tmeme_response = urlopen('http://api.tweetmeme.com/url_info.json?url=' . urlencode($url));
        $tmeme_data = json_decode($tmeme_response, true);
        if (isset($tmeme_data['story']['url_count']) && (int)$tmeme_data['story']['url_count'] >= $tmeme_cnt) {
          $tmeme_cnt = $tmeme_data['story']['url_count'];
          if ($tmeme_meta == '') {
            add_post_meta($post->ID, 'tmeme_cache', time() . ':' . $tmeme_cnt);
          } else {
            update_post_meta($post->ID, 'tmeme_cache', time() . ':' . $tmeme_cnt);
          }
        }
      }
                        
      $cnt = max($btype_cnt, $topsy_cnt, $tmeme_cnt);
    }
        
    // retweet
    $twitter_status = "RT @necolas: ".$title." - ".$short_url;
    $twitter_button = '<a class="social retweet" rel="external nofollow" title="Retweet this article" href="http://twitter.com/home?status='.urlencode($twitter_status).'">'.$cnt.' <span>retweet</span></a>';
    echo $twitter_button;

    // delicious saves
    $saves = saves_delicious($url);
    $delicious_button = ' <a class="social delicious" rel="external nofollow" title="Save this article to Delicious" href="http://del.icio.us/post?url='.$url.'">'.$saves.'<span>save</span></a>';
    echo $delicious_button;
  }
}

// convert file contents into string
function urlopen($url) {
  if (function_exists('curl_init')) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
  } else {
    return file_get_contents($url);
  }
}

// bit.ly url shortening
function shorten_bitly($url, $bitly_key, $bitly_login) {
  if ($bitly_key && function_exists('json_decode')) {
    $bitly_url = 'http://api.j.mp/v3/shorten';
    $bitly_vars = '?login=' . $bitly_login . '&apiKey=' .$bitly_key . '&longUrl=' . urlencode($url);

    $response =  urlopen($bitly_url . $bitly_vars);
    if ($response) {
      $data = json_decode($response, true);
      if (isset($data['data']['url'])) {
        $link = $data['data']['url'];
      }
    }
  }
  return $link;
}

// number of delicious saves
function saves_delicious($url) {
  if (function_exists('json_decode')) {
    $deli_url = 'http://badges.del.icio.us/feeds/json/url/data';
    $deli_vars = '?url=' . urlencode($url);

    $response =  urlopen($deli_url . $deli_vars);
    if ($response) {
      $data = json_decode($response, true);
      if (isset($data['0']['total_posts'])) {
        $num = $data['0']['total_posts'];
      }
    }
  }
  return $num;
}

single.php (within the loop)

// USE (e.g. in loop in index.php / single.php)

if (function_exists('tweet_save')) {
  tweet_save(get_permalink());
}