source: trunk/include/functions_rate.inc.php @ 1092

<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery                           |
// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
// | Copyright (C) 2003-2006 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | branch        : BSF (Best So Far)
// | file          : $RCSfile$
// | last update   : $Date: 2006-03-22 01:01:47 +0000 (Wed, 22 Mar 2006) $
// | last modifier : $Author: rvelices $
// | revision      : $Revision: 1092 $
// +-----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify  |
// | it under the terms of the GNU General Public License as published by  |
// | the Free Software Foundation                                          |
// |                                                                       |
// | This program is distributed in the hope that it will be useful, but   |
// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
// | General Public License for more details.                              |
// |                                                                       |
// | You should have received a copy of the GNU General Public License     |
// | along with this program; if not, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+

/**
 * rate a picture by a user
 *
 * @param int image identifier
 * @param int rate
 * @return void
 */
function rate_picture($image_id, $rate)
{
  global $conf, $user;

  if (!isset($rate)
      or !$conf['rate']
      or !in_array($rate, $conf['rate_items']))
  {
    return;
  }

  $user_anonymous = is_autorize_status(ACCESS_CLASSIC) ? false : true;

  if ($user_anonymous and !$conf['rate_anonymous'])
  {
    return;
  }

  if ($user_anonymous)
  {
    $ip_components = explode('.', $_SERVER["REMOTE_ADDR"]);
    if (count($ip_components) > 3)
    {
      array_pop($ip_components);
    }
    $anonymous_id = implode ('.', $ip_components);

    if (isset($_COOKIE['pwg_anonymous_rater']))
    {
      if ($anonymous_id != $_COOKIE['pwg_anonymous_rater'])
      { // client has changed his IP adress or he's trying to fool us
        $query = '
SELECT element_id
  FROM '.RATE_TABLE.'
  WHERE user_id = '.$user['id'].'
    AND anonymous_id = \''.$anonymous_id.'\'
;';
        $already_there = array_from_query($query, 'element_id');

        if (count($already_there) > 0)
        {
          $query = '
DELETE
  FROM '.RATE_TABLE.'
  WHERE user_id = '.$user['id'].'
    AND anonymous_id = \''.$_COOKIE['pwg_anonymous_rater'].'\'
    AND element_id NOT IN ('.implode(',', $already_there).')
;';
           pwg_query($query);
         }

         $query = '
UPDATE
  '.RATE_TABLE.'
  SET anonymous_id = \'' .$anonymous_id.'\'
  WHERE user_id = '.$user['id'].'
    AND anonymous_id = \'' . $_COOKIE['pwg_anonymous_rater'].'\'
;';
         pwg_query($query);

         setcookie(
            'pwg_anonymous_rater',
            $anonymous_id,
            strtotime('+10 years'),
            cookie_path()
           );
      } // end client changed ip
    } // end client has cookie
    else
    {
      setcookie(
          'pwg_anonymous_rater',
          $anonymous_id,
          strtotime('+10 years'),
          cookie_path()
          );
    }
  } // end anonymous user
  $query = '
DELETE
  FROM '.RATE_TABLE.'
  WHERE element_id = '.$image_id.'
  AND user_id = '.$user['id'].'
';
  if (isset($anonymous_id))
  {
    $query.= ' AND anonymous_id = \''.$anonymous_id.'\'';
  }
  pwg_query($query);
  $query = '
INSERT
  INTO '.RATE_TABLE.'
  (user_id,anonymous_id,element_id,rate,date)
  VALUES
  ('
    .$user['id'].','
    .(isset($anonymous_id) ? '\''.$anonymous_id.'\'' : "''").','
    .$image_id.','
    .$rate
    .',NOW())
;';
  pwg_query($query);

  // update of images.average_rate field
  $query = '
SELECT ROUND(AVG(rate),2) AS average_rate
  FROM '.RATE_TABLE.'
  WHERE element_id = '.$image_id.'
;';
  $row = mysql_fetch_array(pwg_query($query));
  $query = '
UPDATE '.IMAGES_TABLE.'
  SET average_rate = '.$row['average_rate'].'
  WHERE id = '.$image_id.'
;';
  pwg_query($query);
}

?>