1 | <?php |
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2 | // +-----------------------------------------------------------------------+ |
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3 | // | PhpWebGallery - a PHP based picture gallery | |
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4 | // | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net | |
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5 | // | Copyright (C) 2003-2006 PhpWebGallery Team - http://phpwebgallery.net | |
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6 | // +-----------------------------------------------------------------------+ |
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7 | // | branch : BSF (Best So Far) |
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8 | // | file : $RCSfile$ |
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9 | // | last update : $Date: 2006-03-16 23:58:16 +0100 (jeu, 16 mar 2006) $ |
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10 | // | last modifier : $Author: rub $ |
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11 | // | revision : $Revision: 1085 $ |
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12 | // | revision : $Revision: 1085 $ |
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13 | // +-----------------------------------------------------------------------+ |
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14 | // | This program is free software; you can redistribute it and/or modify | |
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15 | // | it under the terms of the GNU General Public License as published by | |
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16 | // | the Free Software Foundation | |
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17 | // | | |
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18 | // | This program is distributed in the hope that it will be useful, but | |
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19 | // | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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20 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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21 | // | General Public License for more details. | |
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22 | // | | |
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23 | // | You should have received a copy of the GNU General Public License | |
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24 | // | along with this program; if not, write to the Free Software | |
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25 | // | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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26 | // | USA. | |
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27 | // +-----------------------------------------------------------------------+ |
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28 | |
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29 | |
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30 | /** |
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31 | * Tags available. Each return tag is represented as an array with its id, |
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32 | * its name, its weight (count), its url name. Tags are not sorted. |
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33 | * |
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34 | * The returned list can be a subset of all existing tags due to |
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35 | * permissions, only if a list of forbidden categories is provided |
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36 | * |
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37 | * @param array forbidden categories |
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38 | * @return array |
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39 | */ |
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40 | function get_available_tags($forbidden_categories = null) |
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41 | { |
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42 | // we can find top fatter tags among reachable images |
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43 | $tags_query = ' |
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44 | SELECT tag_id, name, url_name, count(*) counter |
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45 | FROM '.IMAGE_TAG_TABLE.' |
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46 | INNER JOIN '.TAGS_TABLE.' ON tag_id = id'; |
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47 | |
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48 | if (!is_null($forbidden_categories)) |
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49 | { |
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50 | // first we need all reachable image ids |
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51 | $images_query = ' |
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52 | SELECT DISTINCT image_id |
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53 | FROM '.IMAGE_CATEGORY_TABLE.' |
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54 | WHERE category_id NOT IN ('.implode(',', $forbidden_categories).') |
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55 | ;'; |
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56 | $image_ids = array_from_query($images_query, 'image_id'); |
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57 | if ( empty($image_ids) ) |
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58 | { |
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59 | return array(); |
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60 | } |
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61 | $tags_query.= ' |
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62 | WHERE image_id IN ('. |
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63 | wordwrap( |
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64 | implode(', ', $image_ids), |
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65 | 80, |
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66 | "\n" |
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67 | ).')'; |
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68 | } |
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69 | |
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70 | $tags_query.= ' |
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71 | GROUP BY tag_id |
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72 | ;'; |
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73 | |
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74 | $result = pwg_query($tags_query); |
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75 | |
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76 | $tags = array(); |
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77 | |
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78 | while ($row = mysql_fetch_array($result)) |
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79 | { |
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80 | array_push($tags, $row); |
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81 | } |
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82 | |
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83 | return $tags; |
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84 | } |
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85 | |
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86 | /** |
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87 | * All tags, even tags associated to no image. |
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88 | * |
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89 | * @return array |
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90 | */ |
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91 | function get_all_tags() |
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92 | { |
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93 | $query = ' |
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94 | SELECT id AS tag_id, name, url_name |
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95 | FROM '.TAGS_TABLE.' |
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96 | ORDER BY name |
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97 | ;'; |
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98 | $result = pwg_query($query); |
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99 | |
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100 | $tags = array(); |
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101 | |
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102 | while ($row = mysql_fetch_array($result)) |
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103 | { |
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104 | array_push($tags, $row); |
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105 | } |
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106 | |
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107 | return $tags; |
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108 | } |
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109 | |
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110 | /** |
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111 | * Giving a set of tags with a counter for each one, calculate the display |
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112 | * level of each tag. |
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113 | * |
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114 | * The level of each tag depends on the average count of tags. This |
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115 | * calcylation method avoid having very different levels for tags having |
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116 | * nearly the same count when set are small. |
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117 | * |
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118 | * @param array tags |
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119 | * @return array |
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120 | */ |
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121 | function add_level_to_tags($tags) |
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122 | { |
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123 | global $conf; |
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124 | |
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125 | if (count($tags) == 0) |
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126 | { |
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127 | return $tags; |
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128 | } |
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129 | |
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130 | $total_count = 0; |
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131 | |
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132 | foreach ($tags as $tag) |
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133 | { |
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134 | $total_count+= $tag['counter']; |
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135 | } |
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136 | |
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137 | // average count of available tags will determine the level of each tag |
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138 | $tag_average_count = $total_count / count($tags); |
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139 | |
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140 | // tag levels threshold calculation: a tag with an average rate must have |
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141 | // the middle level. |
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142 | for ($i = 1; $i < $conf['tags_levels']; $i++) |
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143 | { |
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144 | $threshold_of_level[$i] = |
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145 | 2 * $i * $tag_average_count / $conf['tags_levels']; |
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146 | } |
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147 | |
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148 | // display sorted tags |
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149 | foreach (array_keys($tags) as $k) |
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150 | { |
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151 | $tags[$k]['level'] = 1; |
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152 | |
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153 | // based on threshold, determine current tag level |
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154 | for ($i = $conf['tags_levels'] - 1; $i >= 1; $i--) |
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155 | { |
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156 | if ($tags[$k]['counter'] > $threshold_of_level[$i]) |
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157 | { |
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158 | $tags[$k]['level'] = $i + 1; |
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159 | break; |
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160 | } |
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161 | } |
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162 | } |
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163 | |
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164 | return $tags; |
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165 | } |
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166 | |
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167 | /** |
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168 | * return the list of image ids corresponding to given tags. AND & OR mode |
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169 | * supported. |
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170 | * |
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171 | * @param array tag ids |
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172 | * @param string mode |
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173 | * @return array |
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174 | */ |
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175 | function get_image_ids_for_tags($tag_ids, $mode = 'AND') |
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176 | { |
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177 | switch ($mode) |
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178 | { |
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179 | case 'AND': |
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180 | { |
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181 | // strategy is to list images associated to each tag |
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182 | $tag_images = array(); |
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183 | |
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184 | foreach ($tag_ids as $tag_id) |
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185 | { |
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186 | $query = ' |
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187 | SELECT image_id |
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188 | FROM '.IMAGE_TAG_TABLE.' |
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189 | WHERE tag_id = '.$tag_id.' |
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190 | ;'; |
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191 | $tag_images[$tag_id] = array_from_query($query, 'image_id'); |
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192 | } |
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193 | |
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194 | // then we calculate the intersection, the images that are associated to |
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195 | // every tags |
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196 | $items = array_shift($tag_images); |
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197 | foreach ($tag_images as $images) |
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198 | { |
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199 | $items = array_intersect($items, $images); |
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200 | } |
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201 | |
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202 | return array_unique($items); |
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203 | break; |
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204 | } |
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205 | case 'OR': |
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206 | { |
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207 | $query = ' |
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208 | SELECT DISTINCT image_id |
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209 | FROM '.IMAGE_TAG_TABLE.' |
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210 | WHERE tag_id IN ('.implode(',', $tag_ids).') |
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211 | ;'; |
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212 | return array_from_query($query, 'image_id'); |
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213 | break; |
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214 | } |
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215 | default: |
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216 | { |
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217 | die('get_image_ids_for_tags: unknown mode, only AND & OR are supported'); |
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218 | } |
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219 | } |
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220 | } |
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221 | ?> |
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