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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 |
|---|---|
| 52 | * @param int $depth Depth of category. Used for padding. |
| 53 | * @param array $args Uses 'selected', 'show_count', and 'value_field' keys, if they exist. |
| 54 | * See wp_dropdown_categories(). |
| 55 | * @param int $id Optional. ID of the current category. Default 0 (unused). |
| 56 | */ |
| 57 | public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) { |
| 58 | $pad = str_repeat( ' ', $depth * 3 ); |
| 59 | |
| 60 | /** This filter is documented in wp-includes/category-template.php */ |
| 61 | $cat_name = apply_filters( 'list_cats', $category->name, $category ); |
| 62 | |
| 63 | if ( isset( $args['value_field'] ) && isset( $category->{$args['value_field']} ) ) { |
| 64 | $value_field = $args['value_field']; |
| 65 | } else { |
| 66 | $value_field = 'term_id'; |
| 67 | } |
| 68 | |
| 69 | $output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $category->{$value_field} ) . '"'; |
| 70 | |