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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 |
|---|---|
| 214 | $query .= get_category_children($hide, " AND cat_ID != "); |
| 215 | } |
| 216 | $query .=" GROUP BY cat_ID"; |
| 217 | if (intval($hide_empty) == 1) $query .= " HAVING cat_count > 0"; |
| 218 | $query .= " ORDER BY $sort_column $sort_order, post_date DESC"; |
| 219 | |
| 220 | $categories = $wpdb->get_results($query); |
| 221 | echo "<select name='cat' class='postform'>\n"; |
| 222 | if (intval($optionall) == 1) { |
| 223 | $all = apply_filters('list_cats', $all); |
| 224 | echo "\t<option value='all'>$all</option>\n"; |
| 225 | } |
| 226 | if (intval($optionnone) == 1) echo "\t<option value='0'>None</option>\n"; |
| 227 | if ($categories) { |
| 228 | foreach ($categories as $category) { |
| 229 | $cat_name = apply_filters('list_cats', $category->cat_name); |
| 230 | echo "\t<option value=\"".$category->cat_ID."\""; |
| 231 | if ($category->cat_ID == $selected) |
| 232 | echo ' selected="selected"'; |
| 233 | echo '>'; |
| 234 | echo stripslashes($cat_name); |
| 235 | if (intval($optioncount) == 1) echo ' ('.$category->cat_count.')'; |
| 236 | if (intval($optiondates) == 1) echo ' '.$category->lastday.'/'.$category->lastmonth; |
| 237 | echo "</option>\n"; |
| 238 | } |
| Line | Code |
| 317 | WHERE post_status = 'publish' $exclusions |
| 318 | GROUP BY category_id"); |
| 319 | foreach ($cat_dates as $cat_date) { |
| 320 | $category_lastday["$cat_date->cat_ID"] = $cat_date->lastday; |
| 321 | $category_lastmonth["$cat_date->cat_ID"] = $cat_date->lastmonth; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | if (intval($optionall) == 1 && !$child_of && $categories) { |
| 326 | $all = apply_filters('list_cats', $all); |
| 327 | $link = "<a href=\"".$file.$querystring_start.'cat'.$querystring_equal.'all">'.$all."</a>"; |
| 328 | if ($list) { |
| 329 | echo "\n\t<li>$link</li>"; |
| 330 | } else { |
| 331 | echo "\t$link<br />\n"; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | $num_found=0; |
| Line | Code |
| 406 | $pre = "\t\t<ul class='children'>"; |
| 407 | $post = "\t\t</ul>\n"; |
| 408 | } else { |
| 409 | $pre = $post = ''; |
| 410 | } |
| 411 | $thelist = $pre . $thelist . $post; |
| 412 | if ($recurse) { |
| 413 | return $thelist; |
| 414 | } |
| 415 | echo apply_filters('list_cats', $thelist); |
| 416 | } |
| 417 | |
| 418 | function in_category($category) { // Check if the current post is in the given category |
| 419 | global $post, $category_cache; |
| 420 | $cats = ''; |
| 421 | foreach ($category_cache[$post->ID] as $cat) : |
| 422 | $cats[] = $cat->category_id; |
| 423 | endforeach; |
| 424 | |