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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.
| Line | Code |
|---|---|
| 256 | if (!empty($exclude)) { |
| 257 | $excats = preg_split('/[\s,]+/',$exclude); |
| 258 | if (count($excats)) { |
| 259 | foreach ($excats as $excat) { |
| 260 | $exclusions .= ' AND cat_ID <> ' . intval($excat) . ' '; |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | $exclusions = apply_filters('list_cats_exclusions', $exclusions); |
| 266 | |
| 267 | if (intval($categories)==0){ |
| 268 | $sort_column = 'cat_'.$sort_column; |
| 269 | |
| 270 | $query = " |
| 271 | SELECT cat_ID, cat_name, category_nicename, category_description, category_parent |
| 272 | FROM $wpdb->categories |
| 273 | WHERE cat_ID > 0 $exclusions |
| 274 | ORDER BY $sort_column $sort_order"; |