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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( |