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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 4 times in this file.
Line | Code |
---|---|
203 | } |
204 | $query .=" GROUP BY cat_ID"; |
205 | if ( intval($hide_empty) == 1 ) |
206 | $query .= " HAVING cat_count > 0"; |
207 | $query .= " ORDER BY $sort_column $sort_order, post_date DESC"; |
208 |
|
209 | $categories = $wpdb->get_results($query); |
210 | echo "<select name='cat' class='postform'>\n"; |
211 | if ( intval($optionall) == 1 ) { |
212 | $all = apply_filters('list_cats', $all); |
213 | echo "\t<option value='0'>$all</option>\n"; |
214 | } |
215 | if ( intval($optionnone) == 1 ) |
216 | echo "\t<option value='-1'>".__('None')."</option>\n"; |
217 | if ( $categories ) { |
218 | foreach ( $categories as $category ) { |
219 | $cat_name = apply_filters('list_cats', $category->cat_name, $category); |
220 | echo "\t<option value=\"".$category->cat_ID."\""; |
221 | if ( $category->cat_ID == $selected ) |
222 | echo ' selected="selected"'; |
223 | echo '>'; |
224 | echo $cat_name; |
225 | if ( intval($optioncount) == 1 ) |
226 | echo ' ('.$category->cat_count.')'; |
227 | if ( intval($optiondates) == 1 ) |
228 | echo ' '.$category->lastday.'/'.$category->lastmonth; |
Line | Code |
322 | foreach ( (array) $categories as $category ) { |
323 | if ( ( intval($hide_empty) == 0 || $category->category_count) && (!$hierarchical || $category->category_parent == $child_of) ) { |
324 | $num_found++; |
325 | $link = '<a href="'.get_category_link($category->cat_ID).'" '; |
326 | if ( $use_desc_for_title == 0 || empty($category->category_description) ) |
327 | $link .= 'title="'. sprintf(__("View all posts filed under %s"), attribute_escape($category->cat_name)) . '"'; |
328 | else |
329 | $link .= 'title="' . attribute_escape(apply_filters('category_description',$category->category_description,$category)) . '"'; |
330 | $link .= '>'; |
331 | $link .= apply_filters('list_cats', $category->cat_name, $category).'</a>'; |
332 |
|
333 | if ( (! empty($feed_image)) || (! empty($feed)) ) { |
334 |
|
335 | $link .= ' '; |
336 |
|
337 | if ( empty($feed_image) ) |
338 | $link .= '('; |
339 |
|
340 | $link .= '<a href="' . get_category_rss_link(0, $category->cat_ID, $category->category_nicename) . '"'; |
Line | Code |
395 | if ( $list && $child_of && $num_found && $recurse ) { |
396 | $pre = "\t\t<ul class='children'>"; |
397 | $post = "\t\t</ul>\n"; |
398 | } else { |
399 | $pre = $post = ''; |
400 | } |
401 | $thelist = $pre . $thelist . $post; |
402 | if ( $recurse ) |
403 | return $thelist; |
404 | echo apply_filters('list_cats', $thelist); |
405 | } |
406 |
|
407 | function in_category($category) { // Check if the current post is in the given category |
408 | global $category_cache, $post; |
409 |
|
410 | if ( isset( $category_cache[$post->ID][$category] ) ) |
411 | return true; |
412 | else |
413 | return false; |