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wp_terms_checklist( int $post_id, array|string $args = array() )

Output an unordered list of checkbox input elements labelled with term names.

Description

Taxonomy-independent version of wp_category_checklist().

Parameters

$post_id

(int) (Optional) Post ID. Default 0.

$args

(array|string) (Optional) Array or string of arguments for generating a terms checklist.

  • 'descendants_and_self'
    (int) ID of the category to output along with its descendants. Default 0.
  • 'selected_cats'
    (int[]) Array of category IDs to mark as checked. Default false.
  • 'popular_cats'
    (int[]) Array of category IDs to receive the "popular-category" class. Default false.
  • 'walker'
    (object) Walker object to use to build the output. Default is a Walker_Category_Checklist instance.
  • 'taxonomy'
    (string) Taxonomy to generate the checklist for. Default 'category'.
  • 'checked_ontop'
    (bool) Whether to move checked items out of the hierarchy and to the top of the list. Default true.
  • 'echo'
    (bool) Whether to echo the generated markup. False to return the markup instead of echoing it. Default true.

Default value: array()

Source

File: wp-admin/includes/template.php

function wp_terms_checklist( $post_id = 0, $args = array() ) {
	$defaults = array(
		'descendants_and_self' => 0,
		'selected_cats'        => false,
		'popular_cats'         => false,
		'walker'               => null,
		'taxonomy'             => 'category',
		'checked_ontop'        => true,
		'echo'                 => true,
	);

	/**
	 * Filters the taxonomy terms checklist arguments.
	 *
	 * @since 3.4.0
	 *
	 * @see wp_terms_checklist()
	 *
	 * @param array $args    An array of arguments.
	 * @param int   $post_id The post ID.
	 */
	$params = apply_filters( 'wp_terms_checklist_args', $args, $post_id );

	$r = wp_parse_args( $params, $defaults );

	if ( empty( $r['walker'] ) || ! ( $r['walker'] instanceof Walker ) ) {
		$walker = new Walker_Category_Checklist;
	} else {
		$walker = $r['walker'];
	}

	$taxonomy             = $r['taxonomy'];
	$descendants_and_self = (int) $r['descendants_and_self'];

	$args = array( 'taxonomy' => $taxonomy );

	$tax              = get_taxonomy( $taxonomy );
	$args['disabled'] = ! current_user_can( $tax->cap->assign_terms );

	$args['list_only'] = ! empty( $r['list_only'] );

	if ( is_array( $r['selected_cats'] ) ) {
		$args['selected_cats'] = $r['selected_cats'];
	} elseif ( $post_id ) {
		$args['selected_cats'] = wp_get_object_terms( $post_id, $taxonomy, array_merge( $args, array( 'fields' => 'ids' ) ) );
	} else {
		$args['selected_cats'] = array();
	}
	if ( is_array( $r['popular_cats'] ) ) {
		$args['popular_cats'] = $r['popular_cats'];
	} else {
		$args['popular_cats'] = get_terms(
			$taxonomy,
			array(
				'fields'       => 'ids',
				'orderby'      => 'count',
				'order'        => 'DESC',
				'number'       => 10,
				'hierarchical' => false,
			)
		);
	}
	if ( $descendants_and_self ) {
		$categories = (array) get_terms(
			$taxonomy,
			array(
				'child_of'     => $descendants_and_self,
				'hierarchical' => 0,
				'hide_empty'   => 0,
			)
		);
		$self       = get_term( $descendants_and_self, $taxonomy );
		array_unshift( $categories, $self );
	} else {
		$categories = (array) get_terms( $taxonomy, array( 'get' => 'all' ) );
	}

	$output = '';

	if ( $r['checked_ontop'] ) {
		// Post process $categories rather than adding an exclude to the get_terms() query to keep the query the same across all posts (for any query cache)
		$checked_categories = array();
		$keys               = array_keys( $categories );

		foreach ( $keys as $k ) {
			if ( in_array( $categories[ $k ]->term_id, $args['selected_cats'] ) ) {
				$checked_categories[] = $categories[ $k ];
				unset( $categories[ $k ] );
			}
		}

		// Put checked cats on top
		$output .= call_user_func_array( array( $walker, 'walk' ), array( $checked_categories, 0, $args ) );
	}
	// Then the rest of them
	$output .= call_user_func_array( array( $walker, 'walk' ), array( $categories, 0, $args ) );

	if ( $r['echo'] ) {
		echo $output;
	}

	return $output;
}

Changelog

Version Description
4.4.0 Introduced the $echo argument.
3.0.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/wp_terms_checklist