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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 |
|---|---|
| 40 | * @param object $category Category data object. |
| 41 | * @param int $depth Depth of category. Used for padding. |
| 42 | * @param array $args Uses 'selected', 'show_count', and 'value_field' keys, if they exist. |
| 43 | * See {@see wp_dropdown_categories()}. |
| 44 | */ |
| 45 | public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) { |
| 46 | $pad = str_repeat(' ', $depth * 3); |
| 47 | |
| 48 | /** This filter is documented in wp-includes/category-template.php */ |
| 49 | $cat_name = apply_filters( 'list_cats', $category->name, $category ); |
| 50 | |
| 51 | if ( isset( $args['value_field'] ) && isset( $category->{$args['value_field']} ) ) { |
| 52 | $value_field = $args['value_field']; |
| 53 | } else { |
| 54 | $value_field = 'term_id'; |
| 55 | } |
| 56 | |
| 57 | $output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $category->{$value_field} ) . "\""; |
| 58 | |