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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 |
---|---|
251 | if ( $hierarchical ) |
252 | $depth = $r['depth']; // Walk the full depth. |
253 | else |
254 | $depth = -1; // Flat. |
255 |
|
256 | $output .= walk_category_dropdown_tree($categories, $depth, $r); |
257 | $output .= "</select>\n"; |
258 | } |
259 |
|
260 | $output = apply_filters('wp_dropdown_cats', $output); |
261 |
|
262 | if ( $echo ) |
263 | echo $output; |
264 |
|
265 | return $output; |
266 | } |
267 |
|
268 | function wp_list_categories($args = '') { |
269 | $defaults = array( |