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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 |
|---|---|
| 257 | if ( $hierarchical ) |
| 258 | $depth = $r['depth']; // Walk the full depth. |
| 259 | else |
| 260 | $depth = -1; // Flat. |
| 261 | |
| 262 | $output .= walk_category_dropdown_tree($categories, $depth, $r); |
| 263 | $output .= "</select>\n"; |
| 264 | } |
| 265 | |
| 266 | $output = apply_filters('wp_dropdown_cats', $output); |
| 267 | |
| 268 | if ( $echo ) |
| 269 | echo $output; |
| 270 | |
| 271 | return $output; |
| 272 | } |
| 273 | |
| 274 | function wp_list_categories($args = '') { |
| 275 | $defaults = array( |