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<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based photo gallery |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2008-2014 Piwigo Team http://piwigo.org |
// | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net |
// | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick |
// +-----------------------------------------------------------------------+
// | 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. |
// +-----------------------------------------------------------------------+
/**
* @package functions\rate
*/
/**
* Rate a picture by the current user.
*
* @param int $image_id
* @param float $rate
* @return array as return by update_rating_score()
*/
function rate_picture($image_id, $rate)
{
global $conf, $user;
if (!isset($rate)
or !$conf['rate']
or !preg_match('/^[0-9]+$/', $rate)
or !in_array($rate, $conf['rate_items']))
{
return false;
}
$user_anonymous = is_autorize_status(ACCESS_CLASSIC) ? false : true;
if ($user_anonymous and !$conf['rate_anonymous'])
{
return false;
}
$ip_components = explode('.', $_SERVER["REMOTE_ADDR"]);
if (count($ip_components) > 3)
{
array_pop($ip_components);
}
$anonymous_id = implode ('.', $ip_components);
if ($user_anonymous)
{
$save_anonymous_id = pwg_get_cookie_var('anonymous_rater', $anonymous_id);
if ($anonymous_id != $save_anonymous_id)
{ // 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 = \''.$save_anonymous_id.'\'
AND element_id IN ('.implode(',', $already_there).')
;';
pwg_query($query);
}
$query = '
UPDATE '.RATE_TABLE.'
SET anonymous_id = \'' .$anonymous_id.'\'
WHERE user_id = '.$user['id'].'
AND anonymous_id = \'' . $save_anonymous_id.'\'
;';
pwg_query($query);
} // end client changed ip
pwg_set_cookie_var('anonymous_rater', $anonymous_id);
} // end anonymous user
$query = '
DELETE
FROM '.RATE_TABLE.'
WHERE element_id = '.$image_id.'
AND user_id = '.$user['id'].'
';
if ($user_anonymous)
{
$query.= ' AND anonymous_id = \''.$anonymous_id.'\'';
}
pwg_query($query);
$query = '
INSERT
INTO '.RATE_TABLE.'
(user_id,anonymous_id,element_id,rate,date)
VALUES
('
.$user['id'].','
.'\''.$anonymous_id.'\','
.$image_id.','
.$rate
.',NOW())
;';
pwg_query($query);
return update_rating_score($image_id);
}
/**
* Update images.rating_score field.
* We use a bayesian average (http://en.wikipedia.org/wiki/Bayesian_average) with
* C = average number of rates per item
* m = global average rate (all rates)
*
* @param int|false $element_id if false applies to all
* @return array (score, average, count) values are null if $element_id is false
*/
function update_rating_score($element_id = false)
{
if ( ($alt_result = trigger_event('update_rating_score', false, $element_id)) !== false)
{
return $alt_result;
}
$query = '
SELECT element_id,
COUNT(rate) AS rcount,
SUM(rate) AS rsum
FROM '.RATE_TABLE.'
GROUP by element_id';
$all_rates_count = 0;
$all_rates_avg = 0;
$item_ratecount_avg = 0;
$by_item = array();
$result = pwg_query($query);
while ($row = pwg_db_fetch_assoc($result))
{
$all_rates_count += $row['rcount'];
$all_rates_avg += $row['rsum'];
$by_item[$row['element_id']] = $row;
}
if ($all_rates_count>0)
{
$all_rates_avg /= $all_rates_count;
$item_ratecount_avg = $all_rates_count / count($by_item);
}
$updates = array();
foreach ($by_item as $id => $rate_summary )
{
$score = ( $item_ratecount_avg * $all_rates_avg + $rate_summary['rsum'] ) / ($item_ratecount_avg + $rate_summary['rcount']);
$score = round($score,2);
if ($id==$element_id)
{
$return = array(
'score' => $score,
'average' => round($rate_summary['rsum'] / $rate_summary['rcount'], 2),
'count' => $rate_summary['rcount'],
);
}
$updates[] = array( 'id'=>$id, 'rating_score'=>$score );
}
mass_updates(
IMAGES_TABLE,
array(
'primary' => array('id'),
'update' => array('rating_score')
),
$updates
);
//set to null all items with no rate
if ( !isset($by_item[$element_id]) )
{
$query='
SELECT id FROM '.IMAGES_TABLE .'
LEFT JOIN '.RATE_TABLE.' ON id=element_id
WHERE element_id IS NULL AND rating_score IS NOT NULL';
$to_update = array_from_query( $query, 'id');
if ( !empty($to_update) )
{
$query='
UPDATE '.IMAGES_TABLE .'
SET rating_score=NULL
WHERE id IN (' . implode(',',$to_update) . ')';
pwg_query($query);
}
}
return isset($return) ? $return : array('score'=>null, 'average'=>null, 'count'=>0 );
}
?>
|
