Critics have remarked that those four worthies were truly peerless throughout the ages; yet the present falls short of the past—the ancients favored unadorned simplicity, whereas the moderns prefer refined elegance. Styles of substance and ornament rise and fall in succession, shifting with the changing mores of the times; such evolution is simply the natural order of things. The ideal lies in honoring antiquity without clashing with the present, and embracing modernity without succumbing to its flaws—embodying that perfect balance of substance and refinement that defines the true gentleman. There is surely no need to abandon a carved palace in favor of a cave dwelling, or to trade a jade carriage for a primitive cart with solid wooden wheels.🌌 SpectraShell

🌌 SpectraShell

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📄 Viewing: class-walker-category-checklist.php

<?php
/**
 * Taxonomy API: Walker_Category_Checklist class
 *
 * @package WordPress
 * @subpackage Administration
 * @since 4.4.0
 */

/**
 * Core walker class to output an unordered list of category checkbox input elements.
 *
 * @since 2.5.1
 *
 * @see Walker
 * @see wp_category_checklist()
 * @see wp_terms_checklist()
 */
class Walker_Category_Checklist extends Walker {
	public $tree_type = 'category';
	public $db_fields = array(
		'parent' => 'parent',
		'id'     => 'term_id',
	); // TODO: Decouple this.

	/**
	 * Starts the list before the elements are added.
	 *
	 * @see Walker:start_lvl()
	 *
	 * @since 2.5.1
	 *
	 * @param string $output Used to append additional content (passed by reference).
	 * @param int    $depth  Depth of category. Used for tab indentation.
	 * @param array  $args   An array of arguments. See {@see wp_terms_checklist()}.
	 */
	public function start_lvl( &$output, $depth = 0, $args = array() ) {
		$indent  = str_repeat( "\t", $depth );
		$output .= "$indent<ul class='children'>\n";
	}

	/**
	 * Ends the list of after the elements are added.
	 *
	 * @see Walker::end_lvl()
	 *
	 * @since 2.5.1
	 *
	 * @param string $output Used to append additional content (passed by reference).
	 * @param int    $depth  Depth of category. Used for tab indentation.
	 * @param array  $args   An array of arguments. See {@see wp_terms_checklist()}.
	 */
	public function end_lvl( &$output, $depth = 0, $args = array() ) {
		$indent  = str_repeat( "\t", $depth );
		$output .= "$indent</ul>\n";
	}

	/**
	 * Start the element output.
	 *
	 * @see Walker::start_el()
	 *
	 * @since 2.5.1
	 * @since 5.9.0 Renamed `$category` to `$data_object` and `$id` to `$current_object_id`
	 *              to match parent class for PHP 8 named parameter support.
	 *
	 * @param string  $output            Used to append additional content (passed by reference).
	 * @param WP_Term $data_object       The current term object.
	 * @param int     $depth             Depth of the term in reference to parents. Default 0.
	 * @param array   $args              An array of arguments. See {@see wp_terms_checklist()}.
	 * @param int     $current_object_id Optional. ID of the current term. Default 0.
	 */
	public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {
		// Restores the more descriptive, specific name for use within this method.
		$category = $data_object;

		if ( empty( $args['taxonomy'] ) ) {
			$taxonomy = 'category';
		} else {
			$taxonomy = $args['taxonomy'];
		}

		if ( 'category' === $taxonomy ) {
			$name = 'post_category';
		} else {
			$name = 'tax_input[' . $taxonomy . ']';
		}

		$args['popular_cats'] = ! empty( $args['popular_cats'] ) ? array_map( 'intval', $args['popular_cats'] ) : array();

		$class = in_array( $category->term_id, $args['popular_cats'], true ) ? ' class="popular-category"' : '';

		$args['selected_cats'] = ! empty( $args['selected_cats'] ) ? array_map( 'intval', $args['selected_cats'] ) : array();

		if ( ! empty( $args['list_only'] ) ) {
			$aria_checked = 'false';
			$inner_class  = 'category';

			if ( in_array( $category->term_id, $args['selected_cats'], true ) ) {
				$inner_class .= ' selected';
				$aria_checked = 'true';
			}

			$output .= "\n" . '<li' . $class . '>' .
				'<div class="' . $inner_class . '" data-term-id=' . $category->term_id .
				' tabindex="0" role="checkbox" aria-checked="' . $aria_checked . '">' .
				/** This filter is documented in wp-includes/category-template.php */
				esc_html( apply_filters( 'the_category', $category->name, '', '' ) ) . '</div>';
		} else {
			$is_selected         = in_array( $category->term_id, $args['selected_cats'], true );
			$is_disabled         = ! empty( $args['disabled'] );
			$li_element_id       = wp_unique_prefixed_id( "in-{$taxonomy}-{$category->term_id}-" );
			$checkbox_element_id = wp_unique_prefixed_id( "in-{$taxonomy}-{$category->term_id}-" );

			$output .= "\n<li id='" . esc_attr( $li_element_id ) . "'$class>" .
				'<label class="selectit"><input value="' . $category->term_id . '" type="checkbox" name="' . $name . '[]" id="' . esc_attr( $checkbox_element_id ) . '"' .
				checked( $is_selected, true, false ) .
				disabled( $is_disabled, true, false ) . ' /> ' .
				/** This filter is documented in wp-includes/category-template.php */
				esc_html( apply_filters( 'the_category', $category->name, '', '' ) ) . '</label>';
		}
	}

	/**
	 * Ends the element output, if needed.
	 *
	 * @see Walker::end_el()
	 *
	 * @since 2.5.1
	 * @since 5.9.0 Renamed `$category` to `$data_object` to match parent class for PHP 8 named parameter support.
	 *
	 * @param string  $output      Used to append additional content (passed by reference).
	 * @param WP_Term $data_object The current term object.
	 * @param int     $depth       Depth of the term in reference to parents. Default 0.
	 * @param array   $args        An array of arguments. See {@see wp_terms_checklist()}.
	 */
	public function end_el( &$output, $data_object, $depth = 0, $args = array() ) {
		$output .= "</li>\n";
	}
}

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