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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 |
|---|---|
| 202 | } |
| 203 | $query .=" GROUP BY cat_ID"; |
| 204 | if ( intval($hide_empty) == 1 ) |
| 205 | $query .= " HAVING cat_count > 0"; |
| 206 | $query .= " ORDER BY $sort_column $sort_order, post_date DESC"; |
| 207 | |
| 208 | $categories = $wpdb->get_results($query); |
| 209 | echo "<select name='cat' class='postform'>\n"; |
| 210 | if ( intval($optionall) == 1 ) { |
| 211 | $all = apply_filters('list_cats', $all); |
| 212 | echo "\t<option value='0'>$all</option>\n"; |
| 213 | } |
| 214 | if ( intval($optionnone) == 1 ) |
| 215 | echo "\t<option value='-1'>".__('None')."</option>\n"; |
| 216 | if ( $categories ) { |
| 217 | foreach ( $categories as $category ) { |
| 218 | $cat_name = apply_filters('list_cats', $category->cat_name, $category); |
| 219 | echo "\t<option value=\"".$category->cat_ID."\""; |
| 220 | if ( $category->cat_ID == $selected ) |
| 221 | echo ' selected="selected"'; |
| 222 | echo '>'; |
| 223 | echo $cat_name; |
| 224 | if ( intval($optioncount) == 1 ) |
| 225 | echo ' ('.$category->cat_count.')'; |
| 226 | if ( intval($optiondates) == 1 ) |
| 227 | echo ' '.$category->lastday.'/'.$category->lastmonth; |
| Line | Code |
| 321 | foreach ( $categories as $category ) { |
| 322 | if ( ( intval($hide_empty) == 0 || $category->category_count) && (!$hierarchical || $category->category_parent == $child_of) ) { |
| 323 | $num_found++; |
| 324 | $link = '<a href="'.get_category_link($category->cat_ID).'" '; |
| 325 | if ( $use_desc_for_title == 0 || empty($category->category_description) ) |
| 326 | $link .= 'title="'. sprintf(__("View all posts filed under %s"), wp_specialchars($category->cat_name)) . '"'; |
| 327 | else |
| 328 | $link .= 'title="' . wp_specialchars(apply_filters('category_description',$category->category_description,$category)) . '"'; |
| 329 | $link .= '>'; |
| 330 | $link .= apply_filters('list_cats', $category->cat_name, $category).'</a>'; |
| 331 | |
| 332 | if ( (! empty($feed_image)) || (! empty($feed)) ) { |
| 333 | |
| 334 | $link .= ' '; |
| 335 | |
| 336 | if ( empty($feed_image) ) |
| 337 | $link .= '('; |
| 338 | |
| 339 | $link .= '<a href="' . get_category_rss_link(0, $category->cat_ID, $category->category_nicename) . '"'; |
| Line | Code |
| 394 | if ( $list && $child_of && $num_found && $recurse ) { |
| 395 | $pre = "\t\t<ul class='children'>"; |
| 396 | $post = "\t\t</ul>\n"; |
| 397 | } else { |
| 398 | $pre = $post = ''; |
| 399 | } |
| 400 | $thelist = $pre . $thelist . $post; |
| 401 | if ( $recurse ) |
| 402 | return $thelist; |
| 403 | echo apply_filters('list_cats', $thelist); |
| 404 | } |
| 405 | |
| 406 | function in_category($category) { // Check if the current post is in the given category |
| 407 | global $category_cache, $post; |
| 408 | |
| 409 | if ( isset( $category_cache[$post->ID][$category] ) ) |
| 410 | return true; |
| 411 | else |
| 412 | return false; |