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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 |
|---|---|
| 227 | if ( $hierarchical ) |
| 228 | $depth = 0; // Walk the full depth. |
| 229 | else |
| 230 | $depth = -1; // Flat. |
| 231 | |
| 232 | $output .= walk_category_dropdown_tree($categories, $depth, $r); |
| 233 | $output .= "</select>\n"; |
| 234 | } |
| 235 | |
| 236 | $output = apply_filters('wp_dropdown_cats', $output); |
| 237 | |
| 238 | if ( $echo ) |
| 239 | echo $output; |
| 240 | |
| 241 | return $output; |
| 242 | } |
| 243 | |
| 244 | function wp_list_categories($args = '') { |
| 245 | $defaults = array( |