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   1  <?php
   2  
   3  function get_category_children($id, $before = '/', $after = '') {
   4      if ( 0 == $id )
   5          return '';
   6  
   7      $cat_ids = get_all_category_ids();
   8      foreach ( $cat_ids as $cat_id ) {
   9          if ( $cat_id == $id)
  10              continue;
  11  
  12          $category = get_category($cat_id);
  13          if ( $category->category_parent == $id ) {
  14              $chain .= $before.$category->cat_ID.$after;
  15              $chain .= get_category_children($category->cat_ID, $before, $after);
  16          }
  17      }
  18      return $chain;
  19  }
  20  
  21  function get_category_link($category_id) {
  22      global $wp_rewrite;
  23      $catlink = $wp_rewrite->get_category_permastruct();
  24  
  25      if ( empty($catlink) ) {
  26          $file = get_settings('home') . '/';
  27          $catlink = $file . '?cat=' . $category_id;
  28      } else {
  29          $category = &get_category($category_id);
  30          $category_nicename = $category->category_nicename;
  31  
  32          if ( $parent = $category->category_parent )
  33              $category_nicename = get_category_parents($parent, false, '/', true) . $category_nicename . '/';
  34  
  35          $catlink = str_replace('%category%', $category_nicename, $catlink);
  36          $catlink = get_settings('home') . trailingslashit($catlink);
  37      }
  38      return apply_filters('category_link', $catlink, $category_id);
  39  }
  40  
  41  function get_category_parents($id, $link = FALSE, $separator = '/', $nicename = FALSE){
  42      $chain = '';
  43      $parent = &get_category($id);
  44  
  45      if ( $nicename )
  46          $name = $parent->category_nicename;
  47      else
  48          $name = $parent->cat_name;
  49  
  50      if ( $parent->category_parent )
  51          $chain .= get_category_parents($parent->category_parent, $link, $separator, $nicename);
  52  
  53      if ( $link )
  54          $chain .= '<a href="' . get_category_link($parent->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $parent->cat_name) . '">'.$name.'</a>' . $separator;
  55      else
  56          $chain .= $name.$separator;
  57      return $chain;
  58  }
  59  
  60  function get_the_category($id = false) {
  61  global $post, $category_cache;
  62  
  63      if ( !$id )
  64          $id = $post->ID;
  65  
  66      if ( !isset($category_cache[$id]) )
  67          update_post_category_cache($id);
  68  
  69      $categories = $category_cache[$id];
  70  
  71      if ( !empty($categories) )
  72          sort($categories);
  73      else
  74          $categories = array();
  75  
  76      return $categories;
  77  }
  78  
  79  function get_the_category_by_ID($cat_ID) {
  80      $cat_ID = (int) $cat_ID;
  81      $category = &get_category($cat_ID);
  82      return $category->cat_name;
  83  }
  84  
  85  function get_the_category_list($separator = '', $parents='') {
  86      $categories = get_the_category();
  87      if (empty($categories))
  88          return apply_filters('the_category', __('Uncategorized'), $separator, $parents);
  89  
  90      $thelist = '';
  91      if ( '' == $separator ) {
  92          $thelist .= '<ul class="post-categories">';
  93          foreach ( $categories as $category ) {
  94              $thelist .= "\n\t<li>";
  95              switch ( strtolower($parents) ) {
  96                  case 'multiple':
  97                      if ($category->category_parent)
  98                          $thelist .= get_category_parents($category->category_parent, TRUE);
  99                      $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" rel="category tag">'.$category->cat_name.'</a></li>';
 100                      break;
 101                  case 'single':
 102                      $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . ' rel="category tag">';
 103                      if ($category->category_parent)
 104                          $thelist .= get_category_parents($category->category_parent, FALSE);
 105                      $thelist .= $category->cat_name.'</a></li>';
 106                      break;
 107                  case '':
 108                  default:
 109                      $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" rel="category tag">'.$category->cat_name.'</a></li>';
 110              }
 111          }
 112          $thelist .= '</ul>';
 113      } else {
 114          $i = 0;
 115          foreach ( $categories as $category ) {
 116              if ( 0 < $i )
 117                  $thelist .= $separator . ' ';
 118              switch ( strtolower($parents) ) {
 119                  case 'multiple':
 120                      if ( $category->category_parent )
 121                          $thelist .= get_category_parents($category->category_parent, TRUE);
 122                      $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" rel="category tag">'.$category->cat_name.'</a>';
 123                      break;
 124                  case 'single':
 125                      $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" rel="category tag">';
 126                      if ( $category->category_parent )
 127                          $thelist .= get_category_parents($category->category_parent, FALSE);
 128                      $thelist .= "$category->cat_name</a>";
 129                      break;
 130                  case '':
 131                  default:
 132                      $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" rel="category tag">'.$category->cat_name.'</a>';
 133              }
 134              ++$i;
 135          }
 136      }
 137      return apply_filters('the_category', $thelist, $separator, $parents);
 138  }
 139  
 140  function in_category($category) { // Check if the current post is in the given category
 141      global $category_cache, $post;
 142  
 143      if ( isset( $category_cache[$post->ID][$category] ) )
 144          return true;
 145      else
 146          return false;
 147  }
 148  
 149  function the_category($separator = '', $parents='') {
 150      echo get_the_category_list($separator, $parents);
 151  }
 152  
 153  function category_description($category = 0) {
 154      global $cat;
 155      if ( !$category )
 156          $category = $cat;
 157      $category = & get_category($category);
 158      return apply_filters('category_description', $category->category_description, $category->cat_ID);
 159  }
 160  
 161  function wp_dropdown_categories($args = '') {
 162      if ( is_array($args) )
 163          $r = &$args;
 164      else
 165          parse_str($args, $r);
 166  
 167      $defaults = array('show_option_all' => '', 'show_option_none' => '', 'orderby' => 'ID',
 168          'order' => 'ASC', 'show_last_update' => 0, 'show_count' => 0,
 169          'hide_empty' => 1, 'child_of' => 0, 'exclude' => '', 'echo' => 1,
 170          'selected' => 0, 'hierarchical' => 0, 'name' => 'cat',
 171          'class' => 'postform');
 172      $r = array_merge($defaults, $r);
 173      $r['include_last_update_time'] = $r['show_last_update'];
 174      extract($r);
 175  
 176      $categories = get_categories($r);
 177  
 178      $output = '';
 179      if ( ! empty($categories) ) {
 180          $output = "<select name='$name' class='$class'>\n";
 181  
 182          if ( $show_option_all ) {
 183              $show_option_all = apply_filters('list_cats', $show_option_all);
 184              $output .= "\t<option value='0'>$show_option_all</option>\n";
 185          }
 186  
 187          if ( $show_option_none) { 
 188              $show_option_none = apply_filters('list_cats', $show_option_none);        
 189              $output .= "\t<option value='-1'>$show_option_none</option>\n";
 190          }
 191  
 192          if ( $hierarchical )
 193              $depth = 0;  // Walk the full depth.
 194          else
 195              $depth = -1; // Flat.
 196  
 197          $output .= walk_category_dropdown_tree($categories, $depth, $r);
 198          $output .= "</select>\n";
 199      }
 200  
 201      $output = apply_filters('wp_dropdown_cats', $output);
 202  
 203      if ( $echo )
 204          echo $output;
 205  
 206      return $output;
 207  }
 208  
 209  function wp_list_categories($args = '') {
 210      if ( is_array($args) )
 211          $r = &$args;
 212      else
 213          parse_str($args, $r);
 214  
 215      $defaults = array('show_option_all' => '', 'orderby' => 'name',
 216          'order' => 'ASC', 'show_last_update' => 0, 'style' => 'list',
 217          'show_count' => 0, 'hide_empty' => 1, 'use_desc_for_title' => 1,
 218          'child_of' => 0, 'feed' => '', 'feed_image' => '', 'exclude' => '',
 219          'hierarchical' => true, 'title_li' => __('Categories'));
 220      $r = array_merge($defaults, $r);
 221      $r['include_last_update_time'] = $r['show_date'];
 222      extract($r);
 223  
 224      $categories = get_categories($r);
 225      
 226      $output = '';
 227      if ( $title_li && 'list' == $style )
 228              $output = '<li class="categories">' . $r['title_li'] . '<ul>';
 229  
 230      if ( empty($categories) ) {
 231          if ( $list)
 232              $output .= '<li>' . __("No categories") . '</li>';
 233          else
 234              $output .= __("No categories");
 235      } else {
 236          global $wp_query;
 237          $r['current_category'] = $wp_query->get_queried_object_id();
 238          if ( $hierarchical )
 239              $depth = 0;  // Walk the full depth.
 240          else
 241              $depth = -1; // Flat.
 242  
 243          $output .= walk_category_tree($categories, $depth, $r);
 244      }
 245  
 246      if ( $title_li && 'list' == $style )
 247          $output .= '</ul></li>';
 248              
 249      echo apply_filters('list_cats', $output);
 250  }
 251  
 252  //
 253  // Helper functions
 254  //
 255  
 256  function walk_category_tree() {
 257      $walker = new Walker_Category;
 258      $args = func_get_args();
 259      return call_user_func_array(array(&$walker, 'walk'), $args);
 260  }
 261  
 262  function walk_category_dropdown_tree() {
 263      $walker = new Walker_CategoryDropdown;
 264      $args = func_get_args();
 265      return call_user_func_array(array(&$walker, 'walk'), $args);
 266  }
 267  
 268  ?>