function insert_feeds_in_db($feed_url, $blog, $twitter, $bdd)
{
    try {
        // step 1 : get the flux
        $content = file_get_contents($feed_url);
        $x = new SimpleXmlElement($content);
        if (!isset($x->channel->item)) {
            return;
        }
        foreach ($x->channel->item as $entry) {
            $title = mb_convert_encoding($entry->title, 'HTML-ENTITIES', 'UTF-8');
            $title = addslashes($title);
            $link = $entry->link;
            // create tweet
            $tweet = create_tweet($title, $link, $twitter);
            // step 2 : insert in db
            $request = 'INSERT INTO list_of_feeds VALUES(\'' . $tweet . '\', \'' . $blog . '\')';
            $bdd->exec($request);
            // just the first one
            break;
        }
        echo "\n" . 'Feeds saved in DB of ' . $blog . "\n";
    } catch (Exception $e) {
        echo 'Exception reçue : ', $e->getMessage(), "\n";
    }
}
function thanks_for_RT($message, $where)
{
    global $consumerKey, $consumerSecret, $OAuthToken, $OAuthSecret;
    // create new instance
    $tweet = new TwitterOAuth($consumerKey, $consumerSecret, $OAuthToken, $OAuthSecret);
    $thanks_tweet = $message;
    // get
    $retweets = $tweet->get('statuses/retweets_of_me');
    $retweets_id = array();
    foreach ($retweets as $user) {
        $retweets_id[] = array('tweet_id' => $user->id_str, 'created_at' => $user->created_at, 'text' => $user->text);
    }
    $screen_names = array();
    // for each retweet, get the last user who retweeded.
    foreach ($retweets_id as $current_retweet) {
        $method = 'statuses/' . $current_retweet['tweet_id'] . '/retweeted_by';
        $retweet = $tweet->get($method, array('count' => '1'));
        if (!isset($retweet)) {
            continue;
        }
        $screen_name = $retweet[0]->screen_name;
        $screen_names[] = $screen_name;
    }
    // delete doublon
    $screen_names = array_unique($screen_names);
    if (sizeof($screen_names) == 0) {
        return;
    }
    foreach ($screen_names as $screen_name) {
        $more_140 = create_tweet($thanks_tweet, $screen_name, $where);
        if ($more_140 == false) {
            break;
        }
    }
    echo $thanks_tweet . "\n";
    send_tweet($thanks_tweet);
}