<?php

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/**

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* Post API: Walker_PageDropdown class

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*

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* @package WordPress

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* @subpackage Post

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* @since 4.4.0

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*/

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/**

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* Core class used to create an HTML drop-down list of pages.

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*

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* @since 2.1.0

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*

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* @see Walker

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*/

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class Walker_PageDropdown extends Walker {

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/**

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* What the class handles.

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*

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* @since 2.1.0

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* @var string

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*

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* @see Walker::$tree_type

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*/

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public $tree_type = 'page';

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/**

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* Database fields to use.

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*

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* @since 2.1.0

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* @var string[]

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*

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* @see Walker::$db_fields

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* @todo Decouple this

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*/

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public $db_fields = array(

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'parent' => 'post_parent',

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'id' => 'ID',

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);

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/**

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* Starts the element output.

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*

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* @since 2.1.0

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* @since 5.9.0 Renamed `$page` to `$data_object` and `$id` to `$current_object_id`

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* to match parent class for PHP 8 named parameter support.

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*

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* @see Walker::start_el()

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*

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* @param string $output Used to append additional content. Passed by reference.

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* @param WP_Post $data_object Page data object.

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* @param int $depth Optional. Depth of page in reference to parent pages.

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* Used for padding. Default 0.

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* @param array $args Optional. Uses 'selected' argument for selected page to

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* set selected HTML attribute for option element. Uses

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* 'value_field' argument to fill "value" attribute.

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* See wp_dropdown_pages(). Default empty array.

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* @param int $current_object_id Optional. ID of the current page. Default 0.

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*/

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public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {

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// Restores the more descriptive, specific name for use within this method.

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$page = $data_object;

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$pad = str_repeat( '&nbsp;', $depth * 3 );

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if ( ! isset( $args['value_field'] ) || ! isset( $page->{$args['value_field']} ) ) {

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$args['value_field'] = 'ID';

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}

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$output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $page->{$args['value_field']} ) . '"';

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if ( $page->ID === (int) $args['selected'] ) {

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$output .= ' selected="selected"';

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}

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$output .= '>';

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$title = $page->post_title;

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if ( '' === $title ) {

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/* translators: %d: ID of a post. */

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$title = sprintf( __( '#%d (no title)' ), $page->ID );

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}

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/**

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* Filters the page title when creating an HTML drop-down list of pages.

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*

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* @since 3.1.0

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*

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* @param string $title Page title.

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* @param WP_Post $page Page data object.

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*/

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$title = apply_filters( 'list_pages', $title, $page );

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$output .= $pad . esc_html( $title );

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$output .= "</option>\n";

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}

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}

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