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- <?php
- /**
- * Post API: Walker_PageDropdown class
- *
- * @package WordPress
- * @subpackage Post
- * @since 4.4.0
- */
- /**
- * Core class used to create an HTML drop-down list of pages.
- *
- * @since 2.1.0
- *
- * @see Walker
- */
- class Walker_PageDropdown extends Walker {
- /**
- * What the class handles.
- *
- * @since 2.1.0
- * @var string
- *
- * @see Walker::$tree_type
- */
- public $tree_type = 'page';
- /**
- * Database fields to use.
- *
- * @since 2.1.0
- * @var string[]
- *
- * @see Walker::$db_fields
- * @todo Decouple this
- */
- public $db_fields = array(
- 'parent' => 'post_parent',
- 'id' => 'ID',
- );
- /**
- * Starts the element output.
- *
- * @since 2.1.0
- * @since 5.9.0 Renamed `$page` to `$data_object` and `$id` to `$current_object_id`
- * to match parent class for PHP 8 named parameter support.
- *
- * @see Walker::start_el()
- *
- * @param string $output Used to append additional content. Passed by reference.
- * @param WP_Post $data_object Page data object.
- * @param int $depth Optional. Depth of page in reference to parent pages.
- * Used for padding. Default 0.
- * @param array $args Optional. Uses 'selected' argument for selected page to
- * set selected HTML attribute for option element. Uses
- * 'value_field' argument to fill "value" attribute.
- * See wp_dropdown_pages(). Default empty array.
- * @param int $current_object_id Optional. ID of the current page. Default 0.
- */
- public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {
- // Restores the more descriptive, specific name for use within this method.
- $page = $data_object;
- $pad = str_repeat( ' ', $depth * 3 );
- if ( ! isset( $args['value_field'] ) || ! isset( $page->{$args['value_field']} ) ) {
- $args['value_field'] = 'ID';
- }
- $output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $page->{$args['value_field']} ) . '"';
- if ( $page->ID == $args['selected'] ) {
- $output .= ' selected="selected"';
- }
- $output .= '>';
- $title = $page->post_title;
- if ( '' === $title ) {
- /* translators: %d: ID of a post. */
- $title = sprintf( __( '#%d (no title)' ), $page->ID );
- }
- /**
- * Filters the page title when creating an HTML drop-down list of pages.
- *
- * @since 3.1.0
- *
- * @param string $title Page title.
- * @param WP_Post $page Page data object.
- */
- $title = apply_filters( 'list_pages', $title, $page );
- $output .= $pad . esc_html( $title );
- $output .= "</option>\n";
- }
- }
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