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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 209 | extract( $r ); |
| 210 | |
| 211 | $categories = get_categories($r); |
| 212 | |
| 213 | $output = ''; |
| 214 | if ( ! empty($categories) ) { |
| 215 | $output = "<select name='$name' id='$name' class='$class'>\n"; |
| 216 | |
| 217 | if ( $show_option_all ) { |
| 218 | $show_option_all = apply_filters('list_cats', $show_option_all); |
| 219 | $output .= "\t<option value='0'>$show_option_all</option>\n"; |
| 220 | } |
| 221 | |
| 222 | if ( $show_option_none) { |
| 223 | $show_option_none = apply_filters('list_cats', $show_option_none); |
| 224 | $output .= "\t<option value='-1'>$show_option_none</option>\n"; |
| 225 | } |
| 226 | |
| 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); |