http_response_header : ".print_r($http_response_header);

        if(isset($http_response_header) and isset($http_response_header[0])) {
            $httpcodeOK = isset($http_response_header) and isset($http_response_header[0]) and ((strpos($http_response_header[0], '200 OK') !== FALSE) or (strpos($http_response_header[0], '301 Moved Permanently') !== FALSE));
        }
    }

    // if response is not empty and response is OK
    if (isset($data) and isset($httpcodeOK) and $httpcodeOK ) {

        // take charset of page and get it
        preg_match('##Usi', $data, $meta);

        // if meta tag is found
        if (!empty($meta[0])) {
            // retrieve encoding in $enc
            preg_match('#charset="?(.*)"#si', $meta[0], $enc);

            // if charset is found set it otherwise, set it to utf-8
            $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';

        } else {
            $html_charset = 'utf-8';
            $enc[1] = '';
        }

        // replace charset of url to charset of page
        $data = str_replace('charset='.$enc[1], 'charset='.$html_charset, $data);

        return $data;
    }
    else {
        return FALSE;
    }
}

/**
 * Préparation de l'URL avec récupération du contenu avant insertion en base
 */
function prepare_url($url)
{
    $parametres = array();
    $url    = html_entity_decode(trim($url));

    // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
    // from shaarli, by sebsauvage
    $i=strpos($url,'&utm_source='); if ($i!==false) $url=substr($url,0,$i);
    $i=strpos($url,'?utm_source='); if ($i!==false) $url=substr($url,0,$i);
    $i=strpos($url,'#xtor=RSS-'); if ($i!==false) $url=substr($url,0,$i);

    $title  = $url;
    if (!preg_match('!^https?://!i', $url))
        $url = 'http://' . $url;

    $html = Encoding::toUTF8(get_external_file($url,15));
    if (isset($html) and strlen($html) > 0)
    {
        $r = new Readability($html, $url);
        if($r->init())
        {
            $title = $r->articleTitle->innerHTML;
        }
    }

    $parametres['title']    = $title;
    $parametres['content']  = $r->articleContent->innerHTML;

    return $parametres;
}

/**
 * Appel d'une action (mark as fav, archive, delete)
 */
function action_to_do($action, $id, $url, $token)
{
    global $db;

    switch ($action)
    {
        case 'add':
            if ($url == '')
                continue;

            $parametres_url = prepare_url($url);
            $sql_action     = 'INSERT INTO entries ( url, title, content ) VALUES (?, ?, ?)';
            $params_action  = array($url, $parametres_url['title'], $parametres_url['content']);
            break;
        case 'delete':
            if (verif_token($token)) {
                $sql_action     = "DELETE FROM entries WHERE id=?";
                $params_action  = array($id);
            }
            else die('CSRF problem');
            break;
        case 'toggle_fav' :
            if (verif_token($token)) {
                $sql_action     = "UPDATE entries SET is_fav=~is_fav WHERE id=?";
                $params_action  = array($id);
            }
            else die('CSRF problem');
            break;
        case 'toggle_archive' :
            if (verif_token($token)) {
                $sql_action     = "UPDATE entries SET is_read=~is_read WHERE id=?";
                $params_action  = array($id);
            }
            else die('CSRF problem');
            break;
        default:
            break;
    }

    try
    {
        # action query
        if (isset($sql_action))
        {
            $query = $db->getHandle()->prepare($sql_action);
            $query->execute($params_action);
        }
    }
    catch (Exception $e)
    {
        die('action query error : '.$e->getMessage());
    }
}

/**
 * Détermine quels liens afficher : home, fav ou archives
 */
function display_view($view)
{
    global $db;

    switch ($_SESSION['sort'])
    {
        case 'ia':
            $order = 'ORDER BY id';
            break;
        case 'id':
            $order = 'ORDER BY id DESC';
            break;
        case 'ta':
            $order = 'ORDER BY lower(title)';
            break;
        case 'td':
            $order = 'ORDER BY lower(title) DESC';
            break;
        default:
            $order = 'ORDER BY id';
            break;
    }

    switch ($view)
    {
        case 'archive':
            $sql    = "SELECT * FROM entries WHERE is_read=? " . $order;
            $params = array(-1);
            break;
        case 'fav' :
            $sql    = "SELECT * FROM entries WHERE is_fav=? " . $order;
            $params = array(-1);
            break;
        default:
            $sql    = "SELECT * FROM entries WHERE is_read=? " . $order;
            $params = array(0);
            break;
    }

    # view query
    try
    {
        $query  = $db->getHandle()->prepare($sql);
        $query->execute($params);
        $entries = $query->fetchAll();
    }
    catch (Exception $e)
    {
        die('view query error : '.$e->getMessage());
    }

    return $entries;
}

/**
 * Récupère un article en fonction d'un ID
 */
function get_article($id)
{
    global $db;

    $entry  = NULL;
    $sql    = "SELECT * FROM entries WHERE id=?";
    $params = array(intval($id));

    # view article query
    try
    {
        $query  = $db->getHandle()->prepare($sql);
        $query->execute($params);
        $entry = $query->fetchAll();
    }
    catch (Exception $e)
    {
        die('query error : '.$e->getMessage());
    }

    return $entry;
}

/**
 * Vérifie si le jeton passé en $_POST correspond à celui en session
 */
function verif_token($token)
{
    if(isset($_SESSION['token_poche']) && isset($_SESSION['token_time_poche']) && isset($token))
    {
        if($_SESSION['token_poche'] == $token)
        {
            $old_timestamp = time() - (15*60);
            if($_SESSION['token_time_poche'] >= $old_timestamp)
            {
                return TRUE;
            }
            else {
                session_destroy();
            }
        }
        else return FALSE;
    }
    else return FALSE;
}