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<?php

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/**

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* Taxonomy API: Walker_CategoryDropdown class

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* @package WordPress

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* @subpackage Template

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* @since 4.4.0

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/**

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* Core class used to create an HTML dropdown list of Categories.

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* @since 2.1.0

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* @see Walker

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class Walker_CategoryDropdown extends Walker {

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/**

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* What the class handles.

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* @since 2.1.0

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* @var string

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* @see Walker::$tree_type

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public $tree_type = 'category';

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/**

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* Database fields to use.

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* @since 2.1.0

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* @todo Decouple this

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* @var string[]

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* @see Walker::$db_fields

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public $db_fields = array(

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'parent' => 'parent',

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'id' => 'term_id',

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);

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/**

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* Starts the element output.

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* @since 2.1.0

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* @since 5.9.0 Renamed `$category` to `$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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* @see Walker::start_el()

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* @param string $output Used to append additional content (passed by reference).

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* @param WP_Term $data_object Category data object.

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* @param int $depth Depth of category. Used for padding.

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* @param array $args Uses 'selected', 'show_count', and 'value_field' keys, if they exist.

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* See wp_dropdown_categories().

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

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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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$category = $data_object;

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$pad = str_repeat( ' ', $depth * 3 );

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/** This filter is documented in wp-includes/category-template.php */

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$cat_name = apply_filters( 'list_cats', $category->name, $category );

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if ( isset( $args['value_field'] ) && isset( $category->{$args['value_field']} ) ) {

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$value_field = $args['value_field'];

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} else {

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$value_field = 'term_id';

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}

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

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// Type-juggling causes false matches, so we force everything to a string.

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if ( (string) $category->{$value_field} === (string) $args['selected'] ) {

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

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}

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$output .= '>';

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$output .= $pad . $cat_name;

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if ( $args['show_count'] ) {

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$output .= '  (' . number_format_i18n( $category->count ) . ')';

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}

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

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}

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}

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