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<?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: 2006-03-16 23:58:16 +0100 (jeu, 16 mar 2006) $
// | last modifier : $Author: rub $
// | revision : $Revision: 1085 $
// | revision : $Revision: 1085 $
// +-----------------------------------------------------------------------+
// | 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. |
// +-----------------------------------------------------------------------+
/**
* Tags available. Each return tag is represented as an array with its id,
* its name, its weight (count), its url name. Tags are not sorted.
*
* The returned list can be a subset of all existing tags due to
* permissions, only if a list of forbidden categories is provided
*
* @param array forbidden categories
* @return array
*/
function get_available_tags($forbidden_categories = null)
{
// we can find top fatter tags among reachable images
$tags_query = '
SELECT tag_id, name, url_name, count(*) counter
FROM '.IMAGE_TAG_TABLE.'
INNER JOIN '.TAGS_TABLE.' ON tag_id = id';
if (!is_null($forbidden_categories))
{
// first we need all reachable image ids
$images_query = '
SELECT DISTINCT image_id
FROM '.IMAGE_CATEGORY_TABLE.'
WHERE category_id NOT IN ('.implode(',', $forbidden_categories).')
;';
$image_ids = array_from_query($images_query, 'image_id');
if ( empty($image_ids) )
{
return array();
}
$tags_query.= '
WHERE image_id IN ('.
wordwrap(
implode(', ', $image_ids),
80,
"\n"
).')';
}
$tags_query.= '
GROUP BY tag_id
;';
$result = pwg_query($tags_query);
$tags = array();
while ($row = mysql_fetch_array($result))
{
array_push($tags, $row);
}
return $tags;
}
/**
* All tags, even tags associated to no image.
*
* @return array
*/
function get_all_tags()
{
$query = '
SELECT id AS tag_id,
name,
url_name
FROM '.TAGS_TABLE.'
;';
$result = pwg_query($query);
$tags = array();
while ($row = mysql_fetch_array($result))
{
array_push($tags, $row);
}
usort($tags, 'name_compare');
return $tags;
}
/**
* Giving a set of tags with a counter for each one, calculate the display
* level of each tag.
*
* The level of each tag depends on the average count of tags. This
* calcylation method avoid having very different levels for tags having
* nearly the same count when set are small.
*
* @param array tags
* @return array
*/
function add_level_to_tags($tags)
{
global $conf;
if (count($tags) == 0)
{
return $tags;
}
$total_count = 0;
foreach ($tags as $tag)
{
$total_count+= $tag['counter'];
}
// average count of available tags will determine the level of each tag
$tag_average_count = $total_count / count($tags);
// tag levels threshold calculation: a tag with an average rate must have
// the middle level.
for ($i = 1; $i < $conf['tags_levels']; $i++)
{
$threshold_of_level[$i] =
2 * $i * $tag_average_count / $conf['tags_levels'];
}
// display sorted tags
foreach (array_keys($tags) as $k)
{
$tags[$k]['level'] = 1;
// based on threshold, determine current tag level
for ($i = $conf['tags_levels'] - 1; $i >= 1; $i--)
{
if ($tags[$k]['counter'] > $threshold_of_level[$i])
{
$tags[$k]['level'] = $i + 1;
break;
}
}
}
return $tags;
}
/**
* return the list of image ids corresponding to given tags. AND & OR mode
* supported.
*
* @param array tag ids
* @param string mode
* @return array
*/
function get_image_ids_for_tags($tag_ids, $mode = 'AND')
{
switch ($mode)
{
case 'AND':
{
// strategy is to list images associated to each tag
$tag_images = array();
foreach ($tag_ids as $tag_id)
{
$query = '
SELECT image_id
FROM '.IMAGE_TAG_TABLE.'
WHERE tag_id = '.$tag_id.'
;';
$tag_images[$tag_id] = array_from_query($query, 'image_id');
}
// then we calculate the intersection, the images that are associated to
// every tags
$items = array_shift($tag_images);
foreach ($tag_images as $images)
{
$items = array_intersect($items, $images);
}
return array_unique($items);
break;
}
case 'OR':
{
$query = '
SELECT DISTINCT image_id
FROM '.IMAGE_TAG_TABLE.'
WHERE tag_id IN ('.implode(',', $tag_ids).')
;';
return array_from_query($query, 'image_id');
break;
}
default:
{
die('get_image_ids_for_tags: unknown mode, only AND & OR are supported');
}
}
}
?>
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