WP_Customize_Nav_Menus::search_available_items_query

	/**
	 * Ajax handler for searching available menu items.
	 *
	 * @since 4.3.0
	 */
	public function ajax_search_available_items() {
		check_ajax_referer( 'customize-menus', 'customize-menus-nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {
			wp_die( -1 );
		}

		if ( empty( $_POST['search'] ) ) {
			wp_send_json_error( 'nav_menus_missing_search_parameter' );
		}

		$p = isset( $_POST['page'] ) ? absint( $_POST['page'] ) : 0;
		if ( $p < 1 ) {
			$p = 1;
		}

		$s     = sanitize_text_field( wp_unslash( $_POST['search'] ) );
		$items = $this->search_available_items_query(
			array(
				'pagenum' => $p,
				's'       => $s,
			)
		);

		if ( empty( $items ) ) {
			wp_send_json_error( array( 'message' => __( 'No results found.' ) ) );
		} else {
			wp_send_json_success( array( 'items' => $items ) );
		}
	}

	/**
	 * Performs post queries for available-item searching.
	 *
	 * Based on WP_Editor::wp_link_query().
	 *
	 * @since 4.3.0
	 *
	 * @param array $args Optional. Accepts 'pagenum' and 's' (search) arguments.
	 * @return array Menu items.
	 */
	public function search_available_items_query( $args = array() ) {
		$items = array();

		$post_type_objects = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );
		$query             = array(
			'post_type'              => array_keys( $post_type_objects ),
			'suppress_filters'       => true,
			'update_post_term_cache' => false,
			'update_post_meta_cache' => false,
			'post_status'            => 'publish',
			'posts_per_page'         => 20,
		);

		$args['pagenum'] = isset( $args['pagenum'] ) ? absint( $args['pagenum'] ) : 1;
		$query['offset'] = $args['pagenum'] > 1 ? $query['posts_per_page'] * ( $args['pagenum'] - 1 ) : 0;

		if ( isset( $args['s'] ) ) {
			$query['s'] = $args['s'];
		}

		$posts = array();

		// Prepend list of posts with nav_menus_created_posts search results on first page.
		$nav_menus_created_posts_setting = $this->manager->get_setting( 'nav_menus_created_posts' );
		if ( 1 === $args['pagenum'] && $nav_menus_created_posts_setting && count( $nav_menus_created_posts_setting->value() ) > 0 ) {
			$stub_post_query = new WP_Query(
				array_merge(
					$query,
					array(
						'post_status'    => 'auto-draft',
						'post__in'       => $nav_menus_created_posts_setting->value(),
						'posts_per_page' => -1,
					)
				)
			);
			$posts           = array_merge( $posts, $stub_post_query->posts );
		}

		// Query posts.
		$get_posts = new WP_Query( $query );
		$posts     = array_merge( $posts, $get_posts->posts );

		// Create items for posts.
		foreach ( $posts as $post ) {
			$post_title = $post->post_title;
			if ( '' === $post_title ) {
				/* translators: %d: ID of a post. */
				$post_title = sprintf( __( '#%d (no title)' ), $post->ID );
			}

			$post_type_label = $post_type_objects[ $post->post_type ]->labels->singular_name;
			$post_states     = get_post_states( $post );
			if ( ! empty( $post_states ) ) {
				$post_type_label = implode( ',', $post_states );
			}

			$items[] = array(
				'id'         => 'post-' . $post->ID,
				'title'      => html_entity_decode( $post_title, ENT_QUOTES, get_bloginfo( 'charset' ) ),
				'type'       => 'post_type',
				'type_label' => $post_type_label,
				'object'     => $post->post_type,
				'object_id'  => intval( $post->ID ),
				'url'        => get_permalink( intval( $post->ID ) ),
			);
		}

		// Query taxonomy terms.