wp_terms_checklist( int $post_id = 0, array|string $args = array() ): string

Description

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$post_idintoptional

Post ID. Default 0.Default: 0

$argsarray|stringoptional

Array or string of arguments for generating a terms checklist. Default empty array.Default: array()

• $descendants_and_selfintdefault: 0

  ID of the category to output along with its descendants.

• $selected_catsint[]default: false

  Array of category IDs to mark as checked.

• $popular_catsint[]default: false

  Array of category IDs to receive the "popular-category" class.

• $walkerWalkerdefault: empty which results in a Walker_Category_Checklist instance being used

  Walker object to use to build the output.

• $taxonomystringdefault: 'category'

  Taxonomy to generate the checklist for.

• $checked_ontopbooldefault: true

  Whether to move checked items out of the hierarchy and to the top of the list.

• $echobooldefault: true

  Whether to echo the generated markup. False to return the markup instead of echoing it.

Return value

string

HTML list of input elements.

Performance profile

How much work a call to wp_terms_checklist() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Heavy

Reaches the database via wp_get_object_terms().

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

78–121

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 157.

Plugin surface

1 hook

Third-party callbacks on 'wp_terms_checklist_args' run inside this call, and their cost is not bounded by anything here.

Called by

4

4 places in core call this, so the cost is paid more often than your own code shows.

What it touches

• hookthird-party callbacksapply_filters()called directly
• querycontent querywp_get_object_terms()called directly

Further down the call graph this can also reach option, cache, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 24 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_terms_checklist() can have, taken from its control-flow graph on PHP 8.5.

Hooks and filters fired · 1

One hook fires while wp_terms_checklist() runs, in this order:

1. 1
   apply_filters( wp_terms_checklist_args )filterline 102 (+21 into the body)

   Filters the taxonomy terms checklist arguments.

Uses · 8

• apply_filters()Calls the callback functions that have been added to a filter hook.
• wp_parse_args()Merges user defined arguments into defaults array.
• get_taxonomy()Retrieves the taxonomy object of $taxonomy.
• current_user_can()Returns whether the current user has the specified capability.
• wp_get_object_terms()Retrieves the terms associated with the given object(s), in the supplied taxonomies.
• get_terms()Retrieves the terms in a given taxonomy or list of taxonomies.
• get_term()Gets all term data from database by term ID.
• Walker_Category_Checklist::__construct()

Used by · 4

• WP_Posts_List_Table::inline_edit()Outputs the hidden row displayed when inline editing
• _wp_ajax_add_hierarchical_term()Handles adding a hierarchical term via AJAX.
• post_categories_meta_box()Displays post categories form fields.
• wp_category_checklist()Outputs an unordered list of checkbox input elements labeled with category names.

Source code

View on Trac ↗View on GitHub ↗

81function wp_terms_checklist( $post_id = 0, $args = array() ) {82	$defaults = array(83		'descendants_and_self' => 0,84		'selected_cats'        => false,85		'popular_cats'         => false,86		'walker'               => null,87		'taxonomy'             => 'category',88		'checked_ontop'        => true,89		'echo'                 => true,90	);91 92	/**93	 * Filters the taxonomy terms checklist arguments.94	 *95	 * @since 3.4.096	 *97	 * @see wp_terms_checklist()98	 *99	 * @param array|string $args    An array or string of arguments.100	 * @param int          $post_id The post ID.101	 */102	$params = apply_filters( 'wp_terms_checklist_args', $args, $post_id );103 104	$parsed_args = wp_parse_args( $params, $defaults );105 106	if ( empty( $parsed_args['walker'] ) || ! ( $parsed_args['walker'] instanceof Walker ) ) {107		$walker = new Walker_Category_Checklist();108	} else {109		$walker = $parsed_args['walker'];110	}111 112	$taxonomy             = $parsed_args['taxonomy'];113	$descendants_and_self = (int) $parsed_args['descendants_and_self'];114 115	$args = array( 'taxonomy' => $taxonomy );116 117	$tax              = get_taxonomy( $taxonomy );118	$args['disabled'] = ! current_user_can( $tax->cap->assign_terms );119 120	$args['list_only'] = ! empty( $parsed_args['list_only'] );121 122	if ( is_array( $parsed_args['selected_cats'] ) ) {123		$args['selected_cats'] = array_map( 'intval', $parsed_args['selected_cats'] );124	} elseif ( $post_id ) {125		$args['selected_cats'] = wp_get_object_terms( $post_id, $taxonomy, array_merge( $args, array( 'fields' => 'ids' ) ) );126	} else {127		$args['selected_cats'] = array();128	}129 130	if ( is_array( $parsed_args['popular_cats'] ) ) {131		$args['popular_cats'] = array_map( 'intval', $parsed_args['popular_cats'] );132	} else {133		$args['popular_cats'] = get_terms(134			array(135				'taxonomy'     => $taxonomy,136				'fields'       => 'ids',137				'orderby'      => 'count',138				'order'        => 'DESC',139				'number'       => 10,140				'hierarchical' => false,141			)142		);143	}144 145	if ( $descendants_and_self ) {146		$categories = (array) get_terms(147			array(148				'taxonomy'     => $taxonomy,149				'child_of'     => $descendants_and_self,150				'hierarchical' => 0,151				'hide_empty'   => 0,152			)153		);154		$self       = get_term( $descendants_and_self, $taxonomy );155		array_unshift( $categories, $self );156	} else {157		$categories = (array) get_terms(158			array(159				'taxonomy' => $taxonomy,160				'get'      => 'all',

Changelog

Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 6.8.8 tag, from src/wp-admin/includes/template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

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