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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 |
|---|---|
| 185 | extract($r); |
| 186 | |
| 187 | $categories = get_categories($r); |
| 188 | |
| 189 | $output = ''; |
| 190 | if ( ! empty($categories) ) { |
| 191 | $output = "<select name='$name' id='$name' class='$class'>\n"; |
| 192 | |
| 193 | if ( $show_option_all ) { |
| 194 | $show_option_all = apply_filters('list_cats', $show_option_all); |
| 195 | $output .= "\t<option value='0'>$show_option_all</option>\n"; |
| 196 | } |
| 197 | |
| 198 | if ( $show_option_none) { |
| 199 | $show_option_none = apply_filters('list_cats', $show_option_none); |
| 200 | $output .= "\t<option value='-1'>$show_option_none</option>\n"; |
| 201 | } |
| 202 | |
| 203 | if ( $hierarchical ) |
| 204 | $depth = 0; // Walk the full depth. |
| 205 | else |
| 206 | $depth = -1; // Flat. |
| 207 | |
| 208 | $output .= walk_category_dropdown_tree($categories, $depth, $r); |