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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 5 times in this file.
| Line | Code |
|---|---|
| 395 | * 'show_option_none', 'show_option_all', and various forms of the |
| 396 | * term name. |
| 397 | * |
| 398 | * @since 1.2.0 |
| 399 | * |
| 400 | * @see wp_dropdown_categories() |
| 401 | * |
| 402 | * @param string $element Taxonomy element to list. |
| 403 | */ |
| 404 | $show_option_none = apply_filters( 'list_cats', $r['show_option_none'] ); |
| 405 | $output .= "\t<option value='" . esc_attr( $option_none_value ) . "' selected='selected'>$show_option_none</option>\n"; |
| 406 | } |
| 407 | |
| 408 | if ( ! empty( $categories ) ) { |
| 409 | |
| 410 | if ( $r['show_option_all'] ) { |
| 411 | |
| 412 | /** This filter is documented in wp-includes/category-template.php */ |
| 413 | $show_option_all = apply_filters( 'list_cats', $r['show_option_all'] ); |
| 414 | $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 415 | $output .= "\t<option value='0'$selected>$show_option_all</option>\n"; |
| 416 | } |
| 417 | |
| 418 | if ( $r['show_option_none'] ) { |
| 419 | |
| 420 | /** This filter is documented in wp-includes/category-template.php */ |
| 421 | $show_option_none = apply_filters( 'list_cats', $r['show_option_none'] ); |
| 422 | $selected = selected( $option_none_value, $r['selected'], false ); |
| 423 | $output .= "\t<option value='" . esc_attr( $option_none_value ) . "'$selected>$show_option_none</option>\n"; |
| 424 | } |
| 425 | |
| 426 | if ( $r['hierarchical'] ) { |
| 427 | $depth = $r['depth']; // Walk the full depth. |
| 428 | } else { |
| 429 | $depth = -1; // Flat. |
| 430 | } |
| Line | Code |
| 978 | * |
| 979 | * @param string $output Passed by reference. Used to append additional content. |
| 980 | * @param object $category Category data object. |
| 981 | * @param int $depth Depth of category in reference to parents. Default 0. |
| 982 | * @param array $args An array of arguments. @see wp_list_categories() |
| 983 | * @param int $id ID of the current category. |
| 984 | */ |
| 985 | public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) { |
| 986 | /** This filter is documented in wp-includes/category-template.php */ |
| 987 | $cat_name = apply_filters( |
| 988 | 'list_cats', |
| 989 | esc_attr( $category->name ), |
| 990 | $category |
| 991 | ); |
| 992 | |
| 993 | // Don't generate an element if the category name is empty. |
| 994 | if ( ! $cat_name ) { |
| 995 | return; |
| 996 | } |
| Line | Code |
| 1136 | * @param object $category Category data object. |
| 1137 | * @param int $depth Depth of category. Used for padding. |
| 1138 | * @param array $args Uses 'selected', 'show_count', and 'value_field' keys, if they exist. |
| 1139 | * See {@see wp_dropdown_categories()}. |
| 1140 | */ |
| 1141 | public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) { |
| 1142 | $pad = str_repeat(' ', $depth * 3); |
| 1143 | |
| 1144 | /** This filter is documented in wp-includes/category-template.php */ |
| 1145 | $cat_name = apply_filters( 'list_cats', $category->name, $category ); |
| 1146 | |
| 1147 | if ( ! isset( $args['value_field'] ) || ! isset( $category->{$args['value_field']} ) ) { |
| 1148 | $args['value_field'] = 'term_id'; |
| 1149 | } |
| 1150 | |
| 1151 | $output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $category->{$args['value_field']} ) . "\""; |
| 1152 | |
| 1153 | if ( $category->term_id == $args['selected'] ) |
| 1154 | $output .= ' selected="selected"'; |