specified, this function will additionally
	 * check if the query is for one of the authors specified.
	 *
	 * @since 3.1.0
	 *
	 * @param int|string|int[]|string[] $author Optional. User ID, nickname, nicename, or array of such
	 *                                          to check against. Default empty.
	 * @return bool Whether the query is for an existing author archive page.
	 */
	public function is_author( $author = '' ) {
		if ( ! $this->is_author ) {
			return false;
		}

		if ( empty( $author ) ) {
			return true;
		}

		$author_obj = $this->get_queried_object();
		if ( ! $author_obj ) {
			return false;
		}

		$author = array_map( 'strval', (array) $author );

		if ( in_array( (string) $author_obj->ID, $author, true ) ) {
			return true;
		} elseif ( in_array( $author_obj->nickname, $author, true ) ) {
			return true;
		} elseif ( in_array( $author_obj->user_nicename, $author, true ) ) {
			return true;
		}

		return false;
	}

	/**
	 * Determines whether the query is for an existing category archive page.
	 *
	 * If the $category parameter is specified, this function will additionally
	 * check if the query is for one of the categories specified.
	 *
	 * @since 3.1.0
	 *
	 * @param int|string|int[]|string[] $category Optional. Category ID, name, slug, or array of such
	 *                                            to check against. Default empty.
	 * @return bool Whether the query is for an existing category archive page.
	 */
	public function is_category( $category = '' ) {
		if ( ! $this->is_category ) {
			return false;
		}

		if ( empty( $category ) ) {
			return true;
		}

		$cat_obj = $this->get_queried_object();
		if ( ! $cat_obj ) {
			return false;
		}

		$category = array_map( 'strval', (array) $category );

		if ( in_array( (string) $cat_obj->term_id, $category, true ) ) {
			return true;
		} elseif ( in_array( $cat_obj->name, $category, true ) ) {
			return true;
		} elseif ( in_array( $cat_obj->slug, $category, true ) ) {
			return true;
		}

		return false;
	}

	/**
	 * Determines whether the query is for an existing tag archive page.
	 *
	 * If the $tag parameter is specified, this function will additionally
	 * check if the query is for one of the tags specified.
	 *
	 * @since 3.1.0
	 *
	 * @param int|string|int[]|string[] $tag Optional. Tag ID, name, slug, or array of such
	 *                                       to check against. Default empty.
	 * @return bool Whether the query is for an existing tag archive page.
	 */
	public function is_tag( $tag = '' ) {
		if ( ! $this->is_tag ) {
			return false;
		}

		if ( empty( $tag ) ) {
			return true;
		}

		$tag_obj = $this->get_queried_object();
		if ( ! $tag_obj ) {
			return false;
		}

		$tag = array_map( 'strval', (array) $tag );

		if ( in_array( (string) $tag_obj->term_id, $tag, true ) ) {
			return true;
		} elseif ( in_array( $tag_obj->name, $tag, true ) ) {
			return true;
		} elseif ( in_array( $tag_obj->slug, $tag, true ) ) {
			return true;
		}

		return false;
	}

	/**
	 * Determines whether the query is for an existing custom taxonomy archive page.
	 *
	 * If the $taxonomy parameter is specified, this function will additionally
	 * check if the query is for that specific $taxonomy.
	 *
	 * If the $term parameter is specified in addition to the $taxonomy parameter,
	 * this function will additionally check if the query is for one of the terms
	 * specified.
	 *
	 * @since 3.1.0
	 *
	 * @global WP_Taxonomy[] $wp_taxonomies Registered taxonomies.
	 *
	 * @param string|string[]           $taxonomy Optional. Taxonomy slug or slugs to check against.
	 *                                            Default empty.
	 * @param int|string|int[]|string[] $term     Optional. Term ID, name, slug, or array of such
	 *                                            to check against. Default empty.
	 * @return bool Whether the query is for an existing custom taxonomy archive page.
	 *              True for custom taxonomy archive pages, false for built-in taxonomies
	 *              (category and tag archives).
	 */
	public function is_tax( $taxonomy = '', $term = '' ) {
		global $wp_taxonomies;

		if ( ! $this->is_tax ) {
			return false;
		}

		if ( empty( $taxonomy ) ) {
			return true;
		}

		$queried_object = $this->get_queried_object();
		$tax_array      = array_intersect( array_keys( $wp_taxonomies ), (array) $taxonomy );
		$term_array     = (array) $term;

		// Check that the taxonomy matches.
		if ( ! ( isset( $queried_object->taxonomy ) && count( $tax_array ) && in_array( $queried_object->taxonomy, $tax_array, true ) ) ) {
			return false;
		}

		// Only a taxonomy provided.
		if ( empty( $term ) ) {
			return true;
		}

		return isset( $queried_object->term_id ) &&
			count(
				array_intersect(
					array( $queried_object->term_id, $queried_object->name, $queried_object->slug ),
					$term_array
				)
			);
	}

	/**
	 * Determines whether the current URL is within the comments popup window.
	 *
	 * @since 3.1.0
	 * @deprecated 4.5.0
	 *
	 * @return false Always returns false.
	 */
	public function is_comments_popup() {
		_deprecated_function( __FUNCTION__, '4.5.0' );

		return false;
	}

	/**
	 * Determines whether the query is for an existing date archive.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for an existing date archive.
	 */
	public function is_date() {
		return (bool) $this->is_date;
	}

	/**
	 * Determines whether the query is for an existing day archive.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for an existing day archive.
	 */
	public function is_day() {
		return (bool) $this->is_day;
	}

	/**
	 * Determines whether the query is for a feed.
	 *
	 * @since 3.1.0
	 *
	 * @param string|string[] $feeds Optional. Feed type or array of feed types
	 *                                         to check against. Default empty.
	 * @return bool Whether the query is for a feed.
	 */
	public function is_feed( $feeds = '' ) {
		if ( empty( $feeds ) || ! $this->is_feed ) {
			return (bool) $this->is_feed;
		}

		$qv = $this->get( 'feed' );
		if ( 'feed' === $qv ) {
			$qv = get_default_feed();
		}

		return in_array( $qv, (array) $feeds, true );
	}

	/**
	 * Determines whether the query is for a comments feed.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for a comments feed.
	 */
	public function is_comment_feed() {
		return (bool) $this->is_comment_feed;
	}

	/**
	 * Determines whether the query is for the front page of the site.
	 *
	 * This is for what is displayed at your site's main URL.
	 *
	 * Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_on_front'.
	 *
	 * If you set a static page for the front page of your site, this function will return
	 * true when viewing that page.
	 *
	 * Otherwise the same as {@see WP_Query::is_home()}.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for the front page of the site.
	 */
	public function is_front_page() {
		// Most likely case.
		if ( 'posts' === get_option( 'show_on_front' ) && $this->is_home() ) {
			return true;
		} elseif ( 'page' === get_option( 'show_on_front' ) && get_option( 'page_on_front' )
			&& $this->is_page( get_option( 'page_on_front' ) )
		) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Determines whether the query is for the blog homepage.
	 *
	 * This is the page which shows the time based blog content of your site.
	 *
	 * Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_for_posts'.
	 *
	 * If you set a static page for the front page of your site, this function will return
	 * true only on the page you set as the "Posts page".
	 *
	 * @since 3.1.0
	 *
	 * @see WP_Query::is_front_page()
	 *
	 * @return bool Whether the query is for the blog homepage.
	 */
	public function is_home() {
		return (bool) $this->is_home;
	}

	/**
	 * Determines whether the query is for the Privacy Policy page.
	 *
	 * This is the page which shows the Privacy Policy content of your site.
	 *
	 * Depends on the site's "Change your Privacy Policy page" Privacy Settings 'wp_page_for_privacy_policy'.
	 *
	 * This function will return true only on the page you set as the "Privacy Policy page".
	 *
	 * @since 5.2.0
	 *
	 * @return bool Whether the query is for the Privacy Policy page.
	 */
	public function is_privacy_policy() {
		if ( get_option( 'wp_page_for_privacy_policy' )
			&& $this->is_page( get_option( 'wp_page_for_privacy_policy' ) )
		) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Determines whether the query is for an existing month archive.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for an existing month archive.
	 */
	public function is_month() {
		return (bool) $this->is_month;
	}

	/**
	 * Determines whether the query is for an existing single page.
	 *
	 * If the $page parameter is specified, this function will additionally
	 * check if the query is for one of the pages specified.
	 *
	 * @since 3.1.0
	 *
	 * @see WP_Query::is_single()
	 * @see WP_Query::is_singular()
	 *
	 * @param int|string|int[]|string[] $page Optional. Page ID, title, slug, path, or array of such
	 *                                        to check against. Default empty.
	 * @return bool Whether the query is for an existing single page.
	 */
	public function is_page( $page = '' ) {
		if ( ! $this->is_page ) {
			return false;
		}

		if ( empty( $page ) ) {
			return true;
		}

		$page_obj = $this->get_queried_object();
		if ( ! $page_obj ) {
			return false;
		}

		$page = array_map( 'strval', (array) $page );

		if ( in_array( (string) $page_obj->ID, $page, true ) ) {
			return true;
		} elseif ( in_array( $page_obj->post_title, $page, true ) ) {
			return true;
		} elseif ( in_array( $page_obj->post_name, $page, true ) ) {
			return true;
		} else {
			foreach ( $page as $pagepath ) {
				if ( ! strpos( $pagepath, '/' ) ) {
					continue;
				}
				$pagepath_obj = get_page_by_path( $pagepath );

				if ( $pagepath_obj && ( $pagepath_obj->ID == $page_obj->ID ) ) {
					return true;
				}
			}
		}

		return false;
	}

	/**
	 * Determines whether the query is for a paged result and not for the first page.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for a paged result.
	 */
	public function is_paged() {
		return (bool) $this->is_paged;
	}

	/**
	 * Determines whether the query is for a post or page preview.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for a post or page preview.
	 */
	public function is_preview() {
		return (bool) $this->is_preview;
	}

	/**
	 * Determines whether the query is for the robots.txt file.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for the robots.txt file.
	 */
	public function is_robots() {
		return (bool) $this->is_robots;
	}

	/**
	 * Determines whether the query is for the favicon.ico file.
	 *
	 * @since 5.4.0
	 *
	 * @return bool Whether the query is for the favicon.ico file.
	 */
	public function is_favicon() {
		return (bool) $this->is_favicon;
	}

	/**
	 * Determines whether the query is for a search.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for a search.
	 */
	public function is_search() {
		return (bool) $this->is_search;
	}

	/**
	 * Determines whether the query is for an existing single post.
	 *
	 * Works for any post type excluding pages.
	 *
	 * If the $post parameter is specified, this function will additionally
	 * check if the query is for one of the Posts specified.
	 *
	 * @since 3.1.0
	 *
	 * @see WP_Query::is_page()
	 * @see WP_Query::is_singular()
	 *
	 * @param int|string|int[]|string[] $post Optional. Post ID, title, slug, path, or array of such
	 *                                        to check against. Default empty.
	 * @return bool Whether the query is for an existing single post.
	 */
	public function is_single( $post = '' ) {
		if ( ! $this->is_single ) {
			return false;
		}

		if ( empty( $post ) ) {
			return true;
		}

		$post_obj = $this->get_queried_object();
		if ( ! $post_obj ) {
			return false;
		}

		$post = array_map( 'strval', (array) $post );

		if ( in_array( (string) $post_obj->ID, $post, true ) ) {
			return true;
		} elseif ( in_array( $post_obj->post_title, $post, true ) ) {
			return true;
		} elseif ( in_array( $post_obj->post_name, $post, true ) ) {
			return true;
		} else {
			foreach ( $post as $postpath ) {
				if ( ! strpos( $postpath, '/' ) ) {
					continue;
				}
				$postpath_obj = get_page_by_path( $postpath, OBJECT, $post_obj->post_type );

				if ( $postpath_obj && ( $postpath_obj->ID == $post_obj->ID ) ) {
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * Determines whether the query is for an existing single post of any post type
	 * (post, attachment, page, custom post types).
	 *
	 * If the $post_types parameter is specified, this function will additionally
	 * check if the query is for one of the Posts Types specified.
	 *
	 * @since 3.1.0
	 *
	 * @see WP_Query::is_page()
	 * @see WP_Query::is_single()
	 *
	 * @param string|string[] $post_types Optional. Post type or array of post types
	 *                                    to check against. Default empty.
	 * @return bool Whether the query is for an existing single post
	 *              or any of the given post types.
	 */
	public function is_singular( $post_types = '' ) {
		if ( empty( $post_types ) || ! $this->is_singular ) {
			return (bool) $this->is_singular;
		}

		$post_obj = $this->get_queried_object();
		if ( ! $post_obj ) {
			return false;
		}

		return in_array( $post_obj->post_type, (array) $post_types, true );
	}

	/**
	 * Determines whether the query is for a specific time.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for a specific time.
	 */
	public function is_time() {
		return (bool) $this->is_time;
	}

	/**
	 * Determines whether the query is for a trackback endpoint call.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for a trackback endpoint call.
	 */
	public function is_trackback() {
		return (bool) $this->is_trackback;
	}

	/**
	 * Determines whether the query is for an existing year archive.
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is for an existing year archive.
	 */
	public function is_year() {
		return (bool) $this->is_year;
	}

	/**
	 * Determines whether the query is a 404 (returns no results).
	 *
	 * @since 3.1.0
	 *
	 * @return bool Whether the query is a 404 error.
	 */
	public function is_404() {
		return (bool) $this->is_404;
	}

	/**
	 * Determines whether the query is for an embedded post.
	 *
	 * @since 4.4.0
	 *
	 * @return bool Whether the query is for an embedded post.
	 */
	public function is_embed() {
		return (bool) $this->is_embed;
	}

	/**
	 * Determines whether the query is the main query.
	 *
	 * @since 3.3.0
	 *
	 * @global WP_Query $wp_the_query WordPress Query object.
	 *
	 * @return bool Whether the query is the main query.
	 */
	public function is_main_query() {
		global $wp_the_query;
		return $wp_the_query === $this;
	}

	/**
	 * Sets up global post data.
	 *
	 * @since 4.1.0
	 * @since 4.4.0 Added the ability to pass a post ID to `$post`.
	 *
	 * @global int     $id
	 * @global WP_User $authordata
	 * @global string  $currentday
	 * @global string  $currentmonth
	 * @global int     $page
	 * @global array   $pages
	 * @global int     $multipage
	 * @global int     $more
	 * @global int     $numpages
	 *
	 * @param WP_Post|object|int $post WP_Post instance or Post ID/object.
	 * @return true True when finished.
	 */
	public function setup_postdata( $post ) {
		global $id, $authordata, $currentday, $currentmonth, $page, $pages, $multipage, $more, $numpages;

		if ( ! ( $post instanceof WP_Post ) ) {
			$post = get_post( $post );
		}

		if ( ! $post ) {
			return;
		}

		$elements = $this->generate_postdata( $post );
		if ( false === $elements ) {
			return;
		}

		$id           = $elements['id'];
		$authordata   = $elements['authordata'];
		$currentday   = $elements['currentday'];
		$currentmonth = $elements['currentmonth'];
		$page         = $elements['page'];
		$pages        = $elements['pages'];
		$multipage    = $elements['multipage'];
		$more         = $elements['more'];
		$numpages     = $elements['numpages'];

		/**
		 * Fires once the post data has been set up.
		 *
		 * @since 2.8.0
		 * @since 4.1.0 Introduced `$query` parameter.
		 *
		 * @param WP_Post  $post  The Post object (passed by reference).
		 * @param WP_Query $query The current Query object (passed by reference).
		 */
		do_action_ref_array( 'the_post', array( &$post, &$this ) );

		return true;
	}

	/**
	 * Generates post data.
	 *
	 * @since 5.2.0
	 *
	 * @param WP_Post|object|int $post WP_Post instance or Post ID/object.
	 * @return array|false Elements of post or false on failure.
	 */
	public function generate_postdata( $post ) {

		if ( ! ( $post instanceof WP_Post ) ) {
			$post = get_post( $post );
		}

		if ( ! $post ) {
			return false;
		}

		$id = (int) $post->ID;

		$authordata = get_userdata( $post->post_author );

		$currentday   = false;
		$currentmonth = false;

		$post_date = $post->post_date;
		if ( ! empty( $post_date ) && '0000-00-00 00:00:00' !== $post_date ) {
			// Avoid using mysql2date for performance reasons.
			$currentmonth = substr( $post_date, 5, 2 );
			$day          = substr( $post_date, 8, 2 );
			$year         = substr( $post_date, 2, 2 );

			$currentday = sprintf( '%s.%s.%s', $day, $currentmonth, $year );
		}

		$numpages  = 1;
		$multipage = 0;
		$page      = $this->get( 'page' );
		if ( ! $page ) {
			$page = 1;
		}

		/*
		 * Force full post content when viewing the permalink for the $post,
		 * or when on an RSS feed. Otherwise respect the 'more' tag.
		 */
		if ( get_queried_object_id() === $post->ID && ( $this->is_page() || $this->is_single() ) ) {
			$more = 1;
		} elseif ( $this->is_feed() ) {
			$more = 1;
		} else {
			$more = 0;
		}

		$content = $post->post_content;
		if ( str_contains( $content, '<!--nextpage-->' ) ) {
			$content = str_replace( "\n<!--nextpage-->\n", '<!--nextpage-->', $content );
			$content = str_replace( "\n<!--nextpage-->", '<!--nextpage-->', $content );
			$content = str_replace( "<!--nextpage-->\n", '<!--nextpage-->', $content );

			// Remove the nextpage block delimiters, to avoid invalid block structures in the split content.
			$content = str_replace( '<!-- wp:nextpage -->', '', $content );
			$content = str_replace( '<!-- /wp:nextpage -->', '', $content );

			// Ignore nextpage at the beginning of the content.
			if ( str_starts_with( $content, '<!--nextpage-->' ) ) {
				$content = substr( $content, 15 );
			}

			$pages = explode( '<!--nextpage-->', $content );
		} else {
			$pages = array( $post->post_content );
		}

		/**
		 * Filters the "pages" derived from splitting the post content.
		 *
		 * "Pages" are determined by splitting the post content based on the presence
		 * of `<!-- nextpage -->` tags.
		 *
		 * @since 4.4.0
		 *
		 * @param string[] $pages Array of "pages" from the post content split by `<!-- nextpage -->` tags.
		 * @param WP_Post  $post  Current post object.
		 */
		$pages = apply_filters( 'content_pagination', $pages, $post );

		$numpages = count( $pages );

		if ( $numpages > 1 ) {
			if ( $page > 1 ) {
				$more = 1;
			}
			$multipage = 1;
		} else {
			$multipage = 0;
		}

		$elements = compact( 'id', 'authordata', 'currentday', 'currentmonth', 'page', 'pages', 'multipage', 'more', 'numpages' );

		return $elements;
	}

	/**
	 * Generates cache key.
	 *
	 * @since 6.1.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param array  $args Query arguments.
	 * @param string $sql  SQL statement.
	 * @return string Cache key.
	 */
	protected function generate_cache_key( array $args, $sql ) {
		global $wpdb;

		unset(
			$args['cache_results'],
			$args['fields'],
			$args['lazy_load_term_meta'],
			$args['update_post_meta_cache'],
			$args['update_post_term_cache'],
			$args['update_menu_item_cache'],
			$args['suppress_filters']
		);

		if ( empty( $args['post_type'] ) ) {
			if ( $this->is_attachment ) {
				$args['post_type'] = 'attachment';
			} elseif ( $this->is_page ) {
				$args['post_type'] = 'page';
			} else {
				$args['post_type'] = 'post';
			}
		} elseif ( 'any' === $args['post_type'] ) {
			$args['post_type'] = array_values( get_post_types( array( 'exclude_from_search' => false ) ) );
		}
		$args['post_type'] = (array) $args['post_type'];
		// Sort post types to ensure same cache key generation.
		sort( $args['post_type'] );

		if ( isset( $args['post_status'] ) ) {
			$args['post_status'] = (array) $args['post_status'];
			// Sort post status to ensure same cache key generation.
			sort( $args['post_status'] );
		}

		// Add a default orderby value of date to ensure same cache key generation.
		if ( ! isset( $q['orderby'] ) ) {
			$args['orderby'] = 'date';
		}

		$placeholder = $wpdb->placeholder_escape();
		array_walk_recursive(
			$args,
			/*
			 * Replace wpdb placeholders with the string used in the database
			 * query to avoid unreachable cache keys. This is necessary because
			 * the placeholder is randomly generated in each request.
			 *
			 * $value is passed by reference to allow it to be modified.
			 * array_walk_recursive() does not return an array.
			 */
			static function ( &$value ) use ( $wpdb, $placeholder ) {
				if ( is_string( $value ) && str_contains( $value, $placeholder ) ) {
					$value = $wpdb->remove_placeholder_escape( $value );
				}
			}
		);

		ksort( $args );

		// Replace wpdb placeholder in the SQL statement used by the cache key.
		$sql = $wpdb->remove_placeholder_escape( $sql );
		$key = md5( serialize( $args ) . $sql );

		$last_changed = wp_cache_get_last_changed( 'posts' );
		if ( ! empty( $this->tax_query->queries ) ) {
			$last_changed .= wp_cache_get_last_changed( 'terms' );
		}

		return "wp_query:$key:$last_changed";
	}

	/**
	 * After looping through a nested query, this function
	 * restores the $post global to the current post in this query.
	 *
	 * @since 3.7.0
	 *
	 * @global WP_Post $post Global post object.
	 */
	public function reset_postdata() {
		if ( ! empty( $this->post ) ) {
			$GLOBALS['post'] = $this->post;
			$this->setup_postdata( $this->post );
		}
	}

	/**
	 * Lazyloads term meta for posts in the loop.
	 *
	 * @since 4.4.0
	 * @deprecated 4.5.0 See wp_queue_posts_for_term_meta_lazyload().
	 *
	 * @param mixed $check
	 * @param int   $term_id
	 * @return mixed
	 */
	public function lazyload_term_meta( $check, $term_id ) {
		_deprecated_function( __METHOD__, '4.5.0' );
		return $check;
	}

	/**
	 * Lazyloads comment meta for comments in the loop.
	 *
	 * @since 4.4.0
	 * @deprecated 4.5.0 See wp_lazyload_comment_meta().
	 *
	 * @param mixed $check
	 * @param int   $comment_id
	 * @return mixed
	 */
	public function lazyload_comment_meta( $check, $comment_id ) {
		_deprecated_function( __METHOD__, '4.5.0' );
		return $check;
	}
}