Displays post categories form fields.

function post_categories_meta_box( $post, $box ) {
	$defaults = array( 'taxonomy' => 'category' );
	if ( ! isset( $box['args'] ) || ! is_array( $box['args'] ) ) {
		$args = array();
	} else {
		$args = $box['args'];
	}
	$parsed_args = wp_parse_args( $args, $defaults );
	$tax_name    = esc_attr( $parsed_args['taxonomy'] );
	$taxonomy    = get_taxonomy( $parsed_args['taxonomy'] );
	?>
	

		
labels->all_items; ?>
			
labels->most_used ); ?>
		

			


		

			";
			?>
			
ID,
					array(
						'taxonomy'     => $tax_name,
						'popular_cats' => $popular_ids,
					)
				);
				?>
			
	cap->edit_terms ) ) : ?>
			

				
					labels->add_new_item );
					?>
				
				

					labels->add_new_item; ?>
					
						labels->parent_item_colon; ?>
					
					 $tax_name,
						'hide_empty'       => 0,
						'name'             => 'new' . $tax_name . '_parent',
						'orderby'          => 'name',
						'hierarchical'     => 1,
						'show_option_none' => '— ' . $taxonomy->labels->parent_item . ' —',
					);

					/**
					 * Filters the arguments for the taxonomy parent dropdown on the Post Edit page.
					 *
					 * @since 4.4.0
					 *
					 * @param array $parent_dropdown_args {
					 *     Optional. Array of arguments to generate parent dropdown.
					 *
					 *     @type string   $taxonomy         Name of the taxonomy to retrieve.
					 *     @type bool     $hide_if_empty    True to skip generating markup if no
					 *                                      categories are found. Default 0.
					 *     @type string   $name             Value for the 'name' attribute
					 *                                      of the select element.
					 *                                      Default "new{$tax_name}_parent".
					 *     @type string   $orderby          Which column to use for ordering
					 *                                      terms. Default 'name'.
					 *     @type bool|int $hierarchical     Whether to traverse the taxonomy
					 *                                      hierarchy. Default 1.
					 *     @type string   $show_option_none Text to display for the "none" option.
					 *                                      Default "— {$parent} —",
					 *                                      where `$parent` is 'parent_item'
					 *                                      taxonomy label.
					 * }
					 */
					$parent_dropdown_args = apply_filters( 'post_edit_category_parent_dropdown_args', $parent_dropdown_args );

					wp_dropdown_categories( $parent_dropdown_args );
					?>