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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 |
|---|---|
| 285 | if ( !empty($exclude) ) { |
| 286 | $excats = preg_split('/[\s,]+/',$exclude); |
| 287 | if ( count($excats) ) { |
| 288 | foreach ( $excats as $excat ) { |
| 289 | $exclusions .= ' AND cat_ID <> ' . intval($excat) . ' '; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | $exclusions = apply_filters('list_cats_exclusions', $exclusions ); |
| 295 | |
| 296 | if ( intval($categories) == 0 ) { |
| 297 | $sort_column = 'cat_'.$sort_column; |
| 298 | |
| 299 | $query = " |
| 300 | SELECT cat_ID, cat_name, category_nicename, category_description, category_parent, category_count |
| 301 | FROM $wpdb->categories |
| 302 | WHERE cat_ID > 0 $exclusions |
| 303 | ORDER BY $sort_column $sort_order"; |