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/**
 * Comment API: WP_Comment_Query class
 *
 * @package WordPress
 * @subpackage Comments
 * @since 4.4.0
 */

/**
 * Core class used for querying comments.
 *
 * @since 3.1.0
 *
 * @see WP_Comment_Query::__construct() for accepted arguments.
 */
#[AllowDynamicProperties]
class WP_Comment_Query {

	/**
	 * SQL for database query.
	 *
	 * @since 4.0.1
	 * @var string
	 */
	public $request;

	/**
	 * Metadata query container
	 *
	 * @since 3.5.0
	 * @var WP_Meta_Query A meta query instance.
	 */
	public $meta_query = false;

	/**
	 * Metadata query clauses.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $meta_query_clauses;

	/**
	 * SQL query clauses.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $sql_clauses = array(
		'select'  =&gt; '',
		'from'    =&gt; '',
		'where'   =&gt; array(),
		'groupby' =&gt; '',
		'orderby' =&gt; '',
		'limits'  =&gt; '',
	);

	/**
	 * SQL WHERE clause.
	 *
	 * Stored after the {@see 'comments_clauses'} filter is run on the compiled WHERE sub-clauses.
	 *
	 * @since 4.4.2
	 * @var string
	 */
	protected $filtered_where_clause;

	/**
	 * Date query container
	 *
	 * @since 3.7.0
	 * @var WP_Date_Query A date query instance.
	 */
	public $date_query = false;

	/**
	 * Query vars set by the user.
	 *
	 * @since 3.1.0
	 * @var array
	 */
	public $query_vars;

	/**
	 * Default values for query vars.
	 *
	 * @since 4.2.0
	 * @var array
	 */
	public $query_var_defaults;

	/**
	 * List of comments located by the query.
	 *
	 * @since 4.0.0
	 * @var int[]|WP_Comment[]
	 */
	public $comments;

	/**
	 * The amount of found comments for the current query.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $found_comments = 0;

	/**
	 * The number of pages.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $max_num_pages = 0;

	/**
	 * Make private/protected methods readable for backward compatibility.
	 *
	 * @since 4.0.0
	 *
	 * @param string $name      Method to call.
	 * @param array  $arguments Arguments to pass when calling.
	 * @return mixed|false Return value of the callback, false otherwise.
	 */
	public function __call( $name, $arguments ) {
		if ( 'get_search_sql' === $name ) {
			return $this-&gt;get_search_sql( ...$arguments );
		}
		return false;
	}

	/**
	 * Constructor.
	 *
	 * Sets up the comment query, based on the query vars passed.
	 *
	 * @since 4.2.0
	 * @since 4.4.0 `$parent__in` and `$parent__not_in` were added.
	 * @since 4.4.0 Order by `comment__in` was added. `$update_comment_meta_cache`, `$no_found_rows`,
	 *              `$hierarchical`, and `$update_comment_post_cache` were added.
	 * @since 4.5.0 Introduced the `$author_url` argument.
	 * @since 4.6.0 Introduced the `$cache_domain` argument.
	 * @since 4.9.0 Introduced the `$paged` argument.
	 * @since 5.1.0 Introduced the `$meta_compare_key` argument.
	 * @since 5.3.0 Introduced the `$meta_type_key` argument.
	 *
	 * @param string|array $query {
	 *     Optional. Array or query string of comment query parameters. Default empty.
	 *
	 *     @type string          $author_email              Comment author email address. Default empty.
	 *     @type string          $author_url                Comment author URL. Default empty.
	 *     @type int[]           $author__in                Array of author IDs to include comments for. Default empty.
	 *     @type int[]           $author__not_in            Array of author IDs to exclude comments for. Default empty.
	 *     @type int[]           $comment__in               Array of comment IDs to include. Default empty.
	 *     @type int[]           $comment__not_in           Array of comment IDs to exclude. Default empty.
	 *     @type bool            $count                     Whether to return a comment count (true) or array of
	 *                                                      comment objects (false). Default false.
	 *     @type array           $date_query                Date query clauses to limit comments by. See WP_Date_Query.
	 *                                                      Default null.
	 *     @type string          $fields                    Comment fields to return. Accepts 'ids' for comment IDs
	 *                                                      only or empty for all fields. Default empty.
	 *     @type array           $include_unapproved        Array of IDs or email addresses of users whose unapproved
	 *                                                      comments will be returned by the query regardless of
	 *                                                      `$status`. Default empty.
	 *     @type int             $karma                     Karma score to retrieve matching comments for.
	 *                                                      Default empty.
	 *     @type string|string[] $meta_key                  Meta key or keys to filter by.
	 *     @type string|string[] $meta_value                Meta value or values to filter by.
	 *     @type string          $meta_compare              MySQL operator used for comparing the meta value.
	 *                                                      See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type string          $meta_compare_key          MySQL operator used for comparing the meta key.
	 *                                                      See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type string          $meta_type                 MySQL data type that the meta_value column will be CAST to for comparisons.
	 *                                                      See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type string          $meta_type_key             MySQL data type that the meta_key column will be CAST to for comparisons.
	 *                                                      See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type array           $meta_query                An associative array of WP_Meta_Query arguments.
	 *                                                      See WP_Meta_Query::__construct() for accepted values.
	 *     @type int             $number                    Maximum number of comments to retrieve.
	 *                                                      Default empty (no limit).
	 *     @type int             $paged                     When used with `$number`, defines the page of results to return.
	 *                                                      When used with `$offset`, `$offset` takes precedence. Default 1.
	 *     @type int             $offset                    Number of comments to offset the query. Used to build
	 *                                                      LIMIT clause. Default 0.
	 *     @type bool            $no_found_rows             Whether to disable the `SQL_CALC_FOUND_ROWS` query.
	 *                                                      Default: true.
	 *     @type string|array    $orderby                   Comment status or array of statuses. To use 'meta_value'
	 *                                                      or 'meta_value_num', `$meta_key` must also be defined.
	 *                                                      To sort by a specific `$meta_query` clause, use that
	 *                                                      clause's array key. Accepts:
	 *                                                      - 'comment_agent'
	 *                                                      - 'comment_approved'
	 *                                                      - 'comment_author'
	 *                                                      - 'comment_author_email'
	 *                                                      - 'comment_author_IP'
	 *                                                      - 'comment_author_url'
	 *                                                      - 'comment_content'
	 *                                                      - 'comment_date'
	 *                                                      - 'comment_date_gmt'
	 *                                                      - 'comment_ID'
	 *                                                      - 'comment_karma'
	 *                                                      - 'comment_parent'
	 *                                                      - 'comment_post_ID'
	 *                                                      - 'comment_type'
	 *                                                      - 'user_id'
	 *                                                      - 'comment__in'
	 *                                                      - 'meta_value'
	 *                                                      - 'meta_value_num'
	 *                                                      - The value of `$meta_key`
	 *                                                      - The array keys of `$meta_query`
	 *                                                      - false, an empty array, or 'none' to disable `ORDER BY` clause.
	 *                                                      Default: 'comment_date_gmt'.
	 *     @type string          $order                     How to order retrieved comments. Accepts 'ASC', 'DESC'.
	 *                                                      Default: 'DESC'.
	 *     @type int             $parent                    Parent ID of comment to retrieve children of.
	 *                                                      Default empty.
	 *     @type int[]           $parent__in                Array of parent IDs of comments to retrieve children for.
	 *                                                      Default empty.
	 *     @type int[]           $parent__not_in            Array of parent IDs of comments *not* to retrieve
	 *                                                      children for. Default empty.
	 *     @type int[]           $post_author__in           Array of author IDs to retrieve comments for.
	 *                                                      Default empty.
	 *     @type int[]           $post_author__not_in       Array of author IDs *not* to retrieve comments for.
	 *                                                      Default empty.
	 *     @type int             $post_id                   Limit results to those affiliated with a given post ID.
	 *                                                      Default 0.
	 *     @type int[]           $post__in                  Array of post IDs to include affiliated comments for.
	 *                                                      Default empty.
	 *     @type int[]           $post__not_in              Array of post IDs to exclude affiliated comments for.
	 *                                                      Default empty.
	 *     @type int             $post_author               Post author ID to limit results by. Default empty.
	 *     @type string|string[] $post_status               Post status or array of post statuses to retrieve
	 *                                                      affiliated comments for. Pass 'any' to match any value.
	 *                                                      Default empty.
	 *     @type string|string[] $post_type                 Post type or array of post types to retrieve affiliated
	 *                                                      comments for. Pass 'any' to match any value. Default empty.
	 *     @type string          $post_name                 Post name to retrieve affiliated comments for.
	 *                                                      Default empty.
	 *     @type int             $post_parent               Post parent ID to retrieve affiliated comments for.
	 *                                                      Default empty.
	 *     @type string          $search                    Search term(s) to retrieve matching comments for.
	 *                                                      Default empty.
	 *     @type string|array    $status                    Comment statuses to limit results by. Accepts an array
	 *                                                      or space/comma-separated list of 'hold' (`comment_status=0`),
	 *                                                      'approve' (`comment_status=1`), 'all', or a custom
	 *                                                      comment status. Default 'all'.
	 *     @type string|string[] $type                      Include comments of a given type, or array of types.
	 *                                                      Accepts 'comment', 'pings' (includes 'pingback' and
	 *                                                      'trackback'), or any custom type string. Default empty.
	 *     @type string[]        $type__in                  Include comments from a given array of comment types.
	 *                                                      Default empty.
	 *     @type string[]        $type__not_in              Exclude comments from a given array of comment types.
	 *                                                      Default empty.
	 *     @type int             $user_id                   Include comments for a specific user ID. Default empty.
	 *     @type bool|string     $hierarchical              Whether to include comment descendants in the results.
	 *                                                      - 'threaded' returns a tree, with each comment's children
	 *                                                        stored in a `children` property on the `WP_Comment` object.
	 *                                                      - 'flat' returns a flat array of found comments plus
	 *                                                        their children.
	 *                                                      - Boolean `false` leaves out descendants.
	 *                                                      The parameter is ignored (forced to `false`) when
	 *                                                      `$fields` is 'ids' or 'counts'. Accepts 'threaded',
	 *                                                      'flat', or false. Default: false.
	 *     @type string          $cache_domain              Unique cache key to be produced when this query is stored in
	 *                                                      an object cache. Default is 'core'.
	 *     @type bool            $update_comment_meta_cache Whether to prime the metadata cache for found comments.
	 *                                                      Default true.
	 *     @type bool            $update_comment_post_cache Whether to prime the cache for comment posts.
	 *                                                      Default false.
	 * }
	 */
	public function __construct( $query = '' ) {
		$this-&gt;query_var_defaults = array(
			'author_email'              =&gt; '',
			'author_url'                =&gt; '',
			'author__in'                =&gt; '',
			'author__not_in'            =&gt; '',
			'include_unapproved'        =&gt; '',
			'fields'                    =&gt; '',
			'ID'                        =&gt; '',
			'comment__in'               =&gt; '',
			'comment__not_in'           =&gt; '',
			'karma'                     =&gt; '',
			'number'                    =&gt; '',
			'offset'                    =&gt; '',
			'no_found_rows'             =&gt; true,
			'orderby'                   =&gt; '',
			'order'                     =&gt; 'DESC',
			'paged'                     =&gt; 1,
			'parent'                    =&gt; '',
			'parent__in'                =&gt; '',
			'parent__not_in'            =&gt; '',
			'post_author__in'           =&gt; '',
			'post_author__not_in'       =&gt; '',
			'post_ID'                   =&gt; '',
			'post_id'                   =&gt; 0,
			'post__in'                  =&gt; '',
			'post__not_in'              =&gt; '',
			'post_author'               =&gt; '',
			'post_name'                 =&gt; '',
			'post_parent'               =&gt; '',
			'post_status'               =&gt; '',
			'post_type'                 =&gt; '',
			'status'                    =&gt; 'all',
			'type'                      =&gt; '',
			'type__in'                  =&gt; '',
			'type__not_in'              =&gt; '',
			'user_id'                   =&gt; '',
			'search'                    =&gt; '',
			'count'                     =&gt; false,
			'meta_key'                  =&gt; '',
			'meta_value'                =&gt; '',
			'meta_query'                =&gt; '',
			'date_query'                =&gt; null, // See WP_Date_Query.
			'hierarchical'              =&gt; false,
			'cache_domain'              =&gt; 'core',
			'update_comment_meta_cache' =&gt; true,
			'update_comment_post_cache' =&gt; false,
		);

		if ( ! empty( $query ) ) {
			$this-&gt;query( $query );
		}
	}

	/**
	 * Parse arguments passed to the comment query with default query parameters.
	 *
	 * @since 4.2.0 Extracted from WP_Comment_Query::query().
	 *
	 * @param string|array $query WP_Comment_Query arguments. See WP_Comment_Query::__construct()
	 */
	public function parse_query( $query = '' ) {
		if ( empty( $query ) ) {
			$query = $this-&gt;query_vars;
		}

		$this-&gt;query_vars = wp_parse_args( $query, $this-&gt;query_var_defaults );

		/**
		 * Fires after the comment query vars have been parsed.
		 *
		 * @since 4.2.0
		 *
		 * @param WP_Comment_Query $query The WP_Comment_Query instance (passed by reference).
		 */
		do_action_ref_array( 'parse_comment_query', array( &amp;$this ) );
	}

	/**
	 * Sets up the WordPress query for retrieving comments.
	 *
	 * @since 3.1.0
	 * @since 4.1.0 Introduced 'comment__in', 'comment__not_in', 'post_author__in',
	 *              'post_author__not_in', 'author__in', 'author__not_in', 'post__in',
	 *              'post__not_in', 'include_unapproved', 'type__in', and 'type__not_in'
	 *              arguments to $query_vars.
	 * @since 4.2.0 Moved parsing to WP_Comment_Query::parse_query().
	 *
	 * @param string|array $query Array or URL query string of parameters.
	 * @return array|int List of comments, or number of comments when 'count' is passed as a query var.
	 */
	public function query( $query ) {
		$this-&gt;query_vars = wp_parse_args( $query );
		return $this-&gt;get_comments();
	}

	/**
	 * Get a list of comments matching the query vars.
	 *
	 * @since 4.2.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return int|int[]|WP_Comment[] List of comments or number of found comments if `$count` argument is true.
	 */
	public function get_comments() {
		global $wpdb;

		$this-&gt;parse_query();

		// Parse meta query.
		$this-&gt;meta_query = new WP_Meta_Query();
		$this-&gt;meta_query-&gt;parse_query_vars( $this-&gt;query_vars );

		/**
		 * Fires before comments are retrieved.
		 *
		 * @since 3.1.0
		 *
		 * @param WP_Comment_Query $query Current instance of WP_Comment_Query (passed by reference).
		 */
		do_action_ref_array( 'pre_get_comments', array( &amp;$this ) );

		// Reparse query vars, in case they were modified in a 'pre_get_comments' callback.
		$this-&gt;meta_query-&gt;parse_query_vars( $this-&gt;query_vars );
		if ( ! empty( $this-&gt;meta_query-&gt;queries ) ) {
			$this-&gt;meta_query_clauses = $this-&gt;meta_query-&gt;get_sql( 'comment', $wpdb-&gt;comments, 'comment_ID', $this );
		}

		$comment_data = null;

		/**
		 * Filters the comments data before the query takes place.
		 *
		 * Return a non-null value to bypass WordPress' default comment queries.
		 *
		 * The expected return type from this filter depends on the value passed
		 * in the request query vars:
		 * - When `$this-&gt;query_vars['count']` is set, the filter should return
		 *   the comment count as an integer.
		 * - When `'ids' === $this-&gt;query_vars['fields']`, the filter should return
		 *   an array of comment IDs.
		 * - Otherwise the filter should return an array of WP_Comment objects.
		 *
		 * Note that if the filter returns an array of comment data, it will be assigned
		 * to the `comments` property of the current WP_Comment_Query instance.
		 *
		 * Filtering functions that require pagination information are encouraged to set
		 * the `found_comments` and `max_num_pages` properties of the WP_Comment_Query object,
		 * passed to the filter by reference. If WP_Comment_Query does not perform a database
		 * query, it will not have enough information to generate these values itself.
		 *
		 * @since 5.3.0
		 * @since 5.6.0 The returned array of comment data is assigned to the `comments` property
		 *              of the current WP_Comment_Query instance.
		 *
		 * @param array|int|null   $comment_data Return an array of comment data to short-circuit WP's comment query,
		 *                                       the comment count as an integer if `$this-&gt;query_vars['count']` is set,
		 *                                       or null to allow WP to run its normal queries.
		 * @param WP_Comment_Query $query        The WP_Comment_Query instance, passed by reference.
		 */
		$comment_data = apply_filters_ref_array( 'comments_pre_query', array( $comment_data, &amp;$this ) );

		if ( null !== $comment_data ) {
			if ( is_array( $comment_data ) &amp;&amp; ! $this-&gt;query_vars['count'] ) {
				$this-&gt;comments = $comment_data;
			}

			return $comment_data;
		}

		/*
		 * Only use the args defined in the query_var_defaults to compute the key,
		 * but ignore 'fields', 'update_comment_meta_cache', 'update_comment_post_cache' which does not affect query results.
		 */
		$_args = wp_array_slice_assoc( $this-&gt;query_vars, array_keys( $this-&gt;query_var_defaults ) );
		unset( $_args['fields'], $_args['update_comment_meta_cache'], $_args['update_comment_post_cache'] );

		$key          = md5( serialize( $_args ) );
		$last_changed = wp_cache_get_last_changed( 'comment' );

		$cache_key   = &quot;get_comments:$key:$last_changed&quot;;
		$cache_value = wp_cache_get( $cache_key, 'comment' );
		if ( false === $cache_value ) {
			$comment_ids = $this-&gt;get_comment_ids();
			if ( $comment_ids ) {
				$this-&gt;set_found_comments();
			}

			$cache_value = array(
				'comment_ids'    =&gt; $comment_ids,
				'found_comments' =&gt; $this-&gt;found_comments,
			);
			wp_cache_add( $cache_key, $cache_value, 'comment' );
		} else {
			$comment_ids          = $cache_value['comment_ids'];
			$this-&gt;found_comments = $cache_value['found_comments'];
		}

		if ( $this-&gt;found_comments &amp;&amp; $this-&gt;query_vars['number'] ) {
			$this-&gt;max_num_pages = ceil( $this-&gt;found_comments / $this-&gt;query_vars['number'] );
		}

		// If querying for a count only, there's nothing more to do.
		if ( $this-&gt;query_vars['count'] ) {
			// $comment_ids is actually a count in this case.
			return (int) $comment_ids;
		}

		$comment_ids = array_map( 'intval', $comment_ids );

		if ( 'ids' === $this-&gt;query_vars['fields'] ) {
			$this-&gt;comments = $comment_ids;
			return $this-&gt;comments;
		}

		_prime_comment_caches( $comment_ids, $this-&gt;query_vars['update_comment_meta_cache'] );

		// Fetch full comment objects from the primed cache.
		$_comments = array();
		foreach ( $comment_ids as $comment_id ) {
			$_comment = get_comment( $comment_id );
			if ( $_comment ) {
				$_comments[] = $_comment;
			}
		}

		// Prime comment post caches.
		if ( $this-&gt;query_vars['update_comment_post_cache'] ) {
			$comment_post_ids = array();
			foreach ( $_comments as $_comment ) {
				$comment_post_ids[] = $_comment-&gt;comment_post_ID;
			}

			_prime_post_caches( $comment_post_ids, false, false );
		}

		/**
		 * Filters the comment query results.
		 *
		 * @since 3.1.0
		 *
		 * @param WP_Comment[]     $_comments An array of comments.
		 * @param WP_Comment_Query $query     Current instance of WP_Comment_Query (passed by reference).
		 */
		$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &amp;$this ) );

		// Convert to WP_Comment instances.
		$comments = array_map( 'get_comment', $_comments );

		if ( $this-&gt;query_vars['hierarchical'] ) {
			$comments = $this-&gt;fill_descendants( $comments );
		}

		$this-&gt;comments = $comments;
		return $this-&gt;comments;
	}

	/**
	 * Used internally to get a list of comment IDs matching the query vars.
	 *
	 * @since 4.4.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return int|array A single count of comment IDs if a count query. An array of comment IDs if a full query.
	 */
	protected function get_comment_ids() {
		global $wpdb;

		// Assemble clauses related to 'comment_approved'.
		$approved_clauses = array();

		// 'status' accepts an array or a comma-separated string.
		$status_clauses = array();
		$statuses       = wp_parse_list( $this-&gt;query_vars['status'] );

		// Empty 'status' should be interpreted as 'all'.
		if ( empty( $statuses ) ) {
			$statuses = array( 'all' );
		}

		// 'any' overrides other statuses.
		if ( ! in_array( 'any', $statuses, true ) ) {
			foreach ( $statuses as $status ) {
				switch ( $status ) {
					case 'hold':
						$status_clauses[] = &quot;comment_approved = '0'&quot;;
						break;

					case 'approve':
						$status_clauses[] = &quot;comment_approved = '1'&quot;;
						break;

					case 'all':
					case '':
						$status_clauses[] = &quot;( comment_approved = '0' OR comment_approved = '1' )&quot;;
						break;

					default:
						$status_clauses[] = $wpdb-&gt;prepare( 'comment_approved = %s', $status );
						break;
				}
			}

			if ( ! empty( $status_clauses ) ) {
				$approved_clauses[] = '( ' . implode( ' OR ', $status_clauses ) . ' )';
			}
		}

		// User IDs or emails whose unapproved comments are included, regardless of $status.
		if ( ! empty( $this-&gt;query_vars['include_unapproved'] ) ) {
			$include_unapproved = wp_parse_list( $this-&gt;query_vars['include_unapproved'] );

			$unapproved_ids    = array();
			$unapproved_emails = array();
			foreach ( $include_unapproved as $unapproved_identifier ) {
				// Numeric values are assumed to be user IDs.
				if ( is_numeric( $unapproved_identifier ) ) {
					$approved_clauses[] = $wpdb-&gt;prepare( &quot;( user_id = %d AND comment_approved = '0' )&quot;, $unapproved_identifier );
				} else {
					// Otherwise we match against email addresses.
					if ( ! empty( $_GET['unapproved'] ) &amp;&amp; ! empty( $_GET['moderation-hash'] ) ) {
						// Only include requested comment.
						$approved_clauses[] = $wpdb-&gt;prepare( &quot;( comment_author_email = %s AND comment_approved = '0' AND {$wpdb-&gt;comments}.comment_ID = %d )&quot;, $unapproved_identifier, (int) $_GET['unapproved'] );
					} else {
						// Include all of the author's unapproved comments.
						$approved_clauses[] = $wpdb-&gt;prepare( &quot;( comment_author_email = %s AND comment_approved = '0' )&quot;, $unapproved_identifier );
					}
				}
			}
		}

		// Collapse comment_approved clauses into a single OR-separated clause.
		if ( ! empty( $approved_clauses ) ) {
			if ( 1 === count( $approved_clauses ) ) {
				$this-&gt;sql_clauses['where']['approved'] = $approved_clauses[0];
			} else {
				$this-&gt;sql_clauses['where']['approved'] = '( ' . implode( ' OR ', $approved_clauses ) . ' )';
			}
		}

		$order = ( 'ASC' === strtoupper( $this-&gt;query_vars['order'] ) ) ? 'ASC' : 'DESC';

		// Disable ORDER BY with 'none', an empty array, or boolean false.
		if ( in_array( $this-&gt;query_vars['orderby'], array( 'none', array(), false ), true ) ) {
			$orderby = '';
		} elseif ( ! empty( $this-&gt;query_vars['orderby'] ) ) {
			$ordersby = is_array( $this-&gt;query_vars['orderby'] ) ?
				$this-&gt;query_vars['orderby'] :
				preg_split( '/[,\s]/', $this-&gt;query_vars['orderby'] );

			$orderby_array            = array();
			$found_orderby_comment_id = false;
			foreach ( $ordersby as $_key =&gt; $_value ) {
				if ( ! $_value ) {
					continue;
				}

				if ( is_int( $_key ) ) {
					$_orderby = $_value;
					$_order   = $order;
				} else {
					$_orderby = $_key;
					$_order   = $_value;
				}

				if ( ! $found_orderby_comment_id &amp;&amp; in_array( $_orderby, array( 'comment_ID', 'comment__in' ), true ) ) {
					$found_orderby_comment_id = true;
				}

				$parsed = $this-&gt;parse_orderby( $_orderby );

				if ( ! $parsed ) {
					continue;
				}

				if ( 'comment__in' === $_orderby ) {
					$orderby_array[] = $parsed;
					continue;
				}

				$orderby_array[] = $parsed . ' ' . $this-&gt;parse_order( $_order );
			}

			// If no valid clauses were found, order by comment_date_gmt.
			if ( empty( $orderby_array ) ) {
				$orderby_array[] = &quot;$wpdb-&gt;comments.comment_date_gmt $order&quot;;
			}

			// To ensure determinate sorting, always include a comment_ID clause.
			if ( ! $found_orderby_comment_id ) {
				$comment_id_order = '';

				// Inherit order from comment_date or comment_date_gmt, if available.
				foreach ( $orderby_array as $orderby_clause ) {
					if ( preg_match( '/comment_date(?:_gmt)*\ (ASC|DESC)/', $orderby_clause, $match ) ) {
						$comment_id_order = $match[1];
						break;
					}
				}

				// If no date-related order is available, use the date from the first available clause.
				if ( ! $comment_id_order ) {
					foreach ( $orderby_array as $orderby_clause ) {
						if ( false !== strpos( 'ASC', $orderby_clause ) ) {
							$comment_id_order = 'ASC';
						} else {
							$comment_id_order = 'DESC';
						}

						break;
					}
				}

				// Default to DESC.
				if ( ! $comment_id_order ) {
					$comment_id_order = 'DESC';
				}

				$orderby_array[] = &quot;$wpdb-&gt;comments.comment_ID $comment_id_order&quot;;
			}

			$orderby = implode( ', ', $orderby_array );
		} else {
			$orderby = &quot;$wpdb-&gt;comments.comment_date_gmt $order&quot;;
		}

		$number = absint( $this-&gt;query_vars['number'] );
		$offset = absint( $this-&gt;query_vars['offset'] );
		$paged  = absint( $this-&gt;query_vars['paged'] );
		$limits = '';

		if ( ! empty( $number ) ) {
			if ( $offset ) {
				$limits = 'LIMIT ' . $offset . ',' . $number;
			} else {
				$limits = 'LIMIT ' . ( $number * ( $paged - 1 ) ) . ',' . $number;
			}
		}

		if ( $this-&gt;query_vars['count'] ) {
			$fields = 'COUNT(*)';
		} else {
			$fields = &quot;$wpdb-&gt;comments.comment_ID&quot;;
		}

		$post_id = absint( $this-&gt;query_vars['post_id'] );
		if ( ! empty( $post_id ) ) {
			$this-&gt;sql_clauses['where']['post_id'] = $wpdb-&gt;prepare( 'comment_post_ID = %d', $post_id );
		}

		// Parse comment IDs for an IN clause.
		if ( ! empty( $this-&gt;query_vars['comment__in'] ) ) {
			$this-&gt;sql_clauses['where']['comment__in'] = &quot;$wpdb-&gt;comments.comment_ID IN ( &quot; . implode( ',', wp_parse_id_list( $this-&gt;query_vars['comment__in'] ) ) . ' )';
		}

		// Parse comment IDs for a NOT IN clause.
		if ( ! empty( $this-&gt;query_vars['comment__not_in'] ) ) {
			$this-&gt;sql_clauses['where']['comment__not_in'] = &quot;$wpdb-&gt;comments.comment_ID NOT IN ( &quot; . implode( ',', wp_parse_id_list( $this-&gt;query_vars['comment__not_in'] ) ) . ' )';
		}

		// Parse comment parent IDs for an IN clause.
		if ( ! empty( $this-&gt;query_vars['parent__in'] ) ) {
			$this-&gt;sql_clauses['where']['parent__in'] = 'comment_parent IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['parent__in'] ) ) . ' )';
		}

		// Parse comment parent IDs for a NOT IN clause.
		if ( ! empty( $this-&gt;query_vars['parent__not_in'] ) ) {
			$this-&gt;sql_clauses['where']['parent__not_in'] = 'comment_parent NOT IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['parent__not_in'] ) ) . ' )';
		}

		// Parse comment post IDs for an IN clause.
		if ( ! empty( $this-&gt;query_vars['post__in'] ) ) {
			$this-&gt;sql_clauses['where']['post__in'] = 'comment_post_ID IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['post__in'] ) ) . ' )';
		}

		// Parse comment post IDs for a NOT IN clause.
		if ( ! empty( $this-&gt;query_vars['post__not_in'] ) ) {
			$this-&gt;sql_clauses['where']['post__not_in'] = 'comment_post_ID NOT IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['post__not_in'] ) ) . ' )';
		}

		if ( '' !== $this-&gt;query_vars['author_email'] ) {
			$this-&gt;sql_clauses['where']['author_email'] = $wpdb-&gt;prepare( 'comment_author_email = %s', $this-&gt;query_vars['author_email'] );
		}

		if ( '' !== $this-&gt;query_vars['author_url'] ) {
			$this-&gt;sql_clauses['where']['author_url'] = $wpdb-&gt;prepare( 'comment_author_url = %s', $this-&gt;query_vars['author_url'] );
		}

		if ( '' !== $this-&gt;query_vars['karma'] ) {
			$this-&gt;sql_clauses['where']['karma'] = $wpdb-&gt;prepare( 'comment_karma = %d', $this-&gt;query_vars['karma'] );
		}

		// Filtering by comment_type: 'type', 'type__in', 'type__not_in'.
		$raw_types = array(
			'IN'     =&gt; array_merge( (array) $this-&gt;query_vars['type'], (array) $this-&gt;query_vars['type__in'] ),
			'NOT IN' =&gt; (array) $this-&gt;query_vars['type__not_in'],
		);

		$comment_types = array();
		foreach ( $raw_types as $operator =&gt; $_raw_types ) {
			$_raw_types = array_unique( $_raw_types );

			foreach ( $_raw_types as $type ) {
				switch ( $type ) {
					// An empty translates to 'all', for backward compatibility.
					case '':
					case 'all':
						break;

					case 'comment':
					case 'comments':
						$comment_types[ $operator ][] = &quot;''&quot;;
						$comment_types[ $operator ][] = &quot;'comment'&quot;;
						break;

					case 'pings':
						$comment_types[ $operator ][] = &quot;'pingback'&quot;;
						$comment_types[ $operator ][] = &quot;'trackback'&quot;;
						break;

					default:
						$comment_types[ $operator ][] = $wpdb-&gt;prepare( '%s', $type );
						break;
				}
			}

			if ( ! empty( $comment_types[ $operator ] ) ) {
				$types_sql = implode( ', ', $comment_types[ $operator ] );
				$this-&gt;sql_clauses['where'][ 'comment_type__' . strtolower( str_replace( ' ', '_', $operator ) ) ] = &quot;comment_type $operator ($types_sql)&quot;;
			}
		}

		$parent = $this-&gt;query_vars['parent'];
		if ( $this-&gt;query_vars['hierarchical'] &amp;&amp; ! $parent ) {
			$parent = 0;
		}

		if ( '' !== $parent ) {
			$this-&gt;sql_clauses['where']['parent'] = $wpdb-&gt;prepare( 'comment_parent = %d', $parent );
		}

		if ( is_array( $this-&gt;query_vars['user_id'] ) ) {
			$this-&gt;sql_clauses['where']['user_id'] = 'user_id IN (' . implode( ',', array_map( 'absint', $this-&gt;query_vars['user_id'] ) ) . ')';
		} elseif ( '' !== $this-&gt;query_vars['user_id'] ) {
			$this-&gt;sql_clauses['where']['user_id'] = $wpdb-&gt;prepare( 'user_id = %d', $this-&gt;query_vars['user_id'] );
		}

		// Falsey search strings are ignored.
		if ( isset( $this-&gt;query_vars['search'] ) &amp;&amp; strlen( $this-&gt;query_vars['search'] ) ) {
			$search_sql = $this-&gt;get_search_sql(
				$this-&gt;query_vars['search'],
				array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' )
			);

			// Strip leading 'AND'.
			$this-&gt;sql_clauses['where']['search'] = preg_replace( '/^\s*AND\s*/', '', $search_sql );
		}

		// If any post-related query vars are passed, join the posts table.
		$join_posts_table = false;
		$plucked          = wp_array_slice_assoc( $this-&gt;query_vars, array( 'post_author', 'post_name', 'post_parent' ) );
		$post_fields      = array_filter( $plucked );

		if ( ! empty( $post_fields ) ) {
			$join_posts_table = true;
			foreach ( $post_fields as $field_name =&gt; $field_value ) {
				// $field_value may be an array.
				$esses = array_fill( 0, count( (array) $field_value ), '%s' );

				// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
				$this-&gt;sql_clauses['where'][ $field_name ] = $wpdb-&gt;prepare( &quot; {$wpdb-&gt;posts}.{$field_name} IN (&quot; . implode( ',', $esses ) . ')', $field_value );
			}
		}

		// 'post_status' and 'post_type' are handled separately, due to the specialized behavior of 'any'.
		foreach ( array( 'post_status', 'post_type' ) as $field_name ) {
			$q_values = array();
			if ( ! empty( $this-&gt;query_vars[ $field_name ] ) ) {
				$q_values = $this-&gt;query_vars[ $field_name ];
				if ( ! is_array( $q_values ) ) {
					$q_values = explode( ',', $q_values );
				}

				// 'any' will cause the query var to be ignored.
				if ( in_array( 'any', $q_values, true ) || empty( $q_values ) ) {
					continue;
				}

				$join_posts_table = true;

				$esses = array_fill( 0, count( $q_values ), '%s' );

				// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
				$this-&gt;sql_clauses['where'][ $field_name ] = $wpdb-&gt;prepare( &quot; {$wpdb-&gt;posts}.{$field_name} IN (&quot; . implode( ',', $esses ) . ')', $q_values );
			}
		}

		// Comment author IDs for an IN clause.
		if ( ! empty( $this-&gt;query_vars['author__in'] ) ) {
			$this-&gt;sql_clauses['where']['author__in'] = 'user_id IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['author__in'] ) ) . ' )';
		}

		// Comment author IDs for a NOT IN clause.
		if ( ! empty( $this-&gt;query_vars['author__not_in'] ) ) {
			$this-&gt;sql_clauses['where']['author__not_in'] = 'user_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['author__not_in'] ) ) . ' )';
		}

		// Post author IDs for an IN clause.
		if ( ! empty( $this-&gt;query_vars['post_author__in'] ) ) {
			$join_posts_table                              = true;
			$this-&gt;sql_clauses['where']['post_author__in'] = 'post_author IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['post_author__in'] ) ) . ' )';
		}

		// Post author IDs for a NOT IN clause.
		if ( ! empty( $this-&gt;query_vars['post_author__not_in'] ) ) {
			$join_posts_table                                  = true;
			$this-&gt;sql_clauses['where']['post_author__not_in'] = 'post_author NOT IN ( ' . implode( ',', wp_parse_id_list( $this-&gt;query_vars['post_author__not_in'] ) ) . ' )';
		}

		$join    = '';
		$groupby = '';

		if ( $join_posts_table ) {
			$join .= &quot;JOIN $wpdb-&gt;posts ON $wpdb-&gt;posts.ID = $wpdb-&gt;comments.comment_post_ID&quot;;
		}

		if ( ! empty( $this-&gt;meta_query_clauses ) ) {
			$join .= $this-&gt;meta_query_clauses['join'];

			// Strip leading 'AND'.
			$this-&gt;sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $this-&gt;meta_query_clauses['where'] );

			if ( ! $this-&gt;query_vars['count'] ) {
				$groupby = &quot;{$wpdb-&gt;comments}.comment_ID&quot;;
			}
		}

		if ( ! empty( $this-&gt;query_vars['date_query'] ) &amp;&amp; is_array( $this-&gt;query_vars['date_query'] ) ) {
			$this-&gt;date_query = new WP_Date_Query( $this-&gt;query_vars['date_query'], 'comment_date' );

			// Strip leading 'AND'.
			$this-&gt;sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this-&gt;date_query-&gt;get_sql() );
		}

		$where = implode( ' AND ', $this-&gt;sql_clauses['where'] );

		$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );

		/**
		 * Filters the comment query clauses.
		 *
		 * @since 3.1.0
		 *
		 * @param string[]         $clauses An associative array of comment query clauses.
		 * @param WP_Comment_Query $query   Current instance of WP_Comment_Query (passed by reference).
		 */
		$clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &amp;$this ) );

		$fields  = isset( $clauses['fields'] ) ? $clauses['fields'] : '';
		$join    = isset( $clauses['join'] ) ? $clauses['join'] : '';
		$where   = isset( $clauses['where'] ) ? $clauses['where'] : '';
		$orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : '';
		$limits  = isset( $clauses['limits'] ) ? $clauses['limits'] : '';
		$groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : '';

		$this-&gt;filtered_where_clause = $where;

		if ( $where ) {
			$where = 'WHERE ' . $where;
		}

		if ( $groupby ) {
			$groupby = 'GROUP BY ' . $groupby;
		}

		if ( $orderby ) {
			$orderby = &quot;ORDER BY $orderby&quot;;
		}

		$found_rows = '';
		if ( ! $this-&gt;query_vars['no_found_rows'] ) {
			$found_rows = 'SQL_CALC_FOUND_ROWS';
		}

		$this-&gt;sql_clauses['select']  = &quot;SELECT $found_rows $fields&quot;;
		$this-&gt;sql_clauses['from']    = &quot;FROM $wpdb-&gt;comments $join&quot;;
		$this-&gt;sql_clauses['groupby'] = $groupby;
		$this-&gt;sql_clauses['orderby'] = $orderby;
		$this-&gt;sql_clauses['limits']  = $limits;

		$this-&gt;request = &quot;
			{$this-&gt;sql_clauses['select']}
			{$this-&gt;sql_clauses['from']}
			{$where}
			{$this-&gt;sql_clauses['groupby']}
			{$this-&gt;sql_clauses['orderby']}
			{$this-&gt;sql_clauses['limits']}
		&quot;;

		if ( $this-&gt;query_vars['count'] ) {
			return (int) $wpdb-&gt;get_var( $this-&gt;request );
		} else {
			$comment_ids = $wpdb-&gt;get_col( $this-&gt;request );
			return array_map( 'intval', $comment_ids );
		}
	}

	/**
	 * Populates found_comments and max_num_pages properties for the current
	 * query if the limit clause was used.
	 *
	 * @since 4.6.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 */
	private function set_found_comments() {
		global $wpdb;

		if ( $this-&gt;query_vars['number'] &amp;&amp; ! $this-&gt;query_vars['no_found_rows'] ) {
			/**
			 * Filters the query used to retrieve found comment count.
			 *
			 * @since 4.4.0
			 *
			 * @param string           $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'.
			 * @param WP_Comment_Query $comment_query        The `WP_Comment_Query` instance.
			 */
			$found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this );

			$this-&gt;found_comments = (int) $wpdb-&gt;get_var( $found_comments_query );
		}
	}

	/**
	 * Fetch descendants for located comments.
	 *
	 * Instead of calling `get_children()` separately on each child comment, we do a single set of queries to fetch
	 * the descendant trees for all matched top-level comments.
	 *
	 * @since 4.4.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param WP_Comment[] $comments Array of top-level comments whose descendants should be filled in.
	 * @return array
	 */
	protected function fill_descendants( $comments ) {
		global $wpdb;

		$levels = array(
			0 =&gt; wp_list_pluck( $comments, 'comment_ID' ),
		);

		$key          = md5( serialize( wp_array_slice_assoc( $this-&gt;query_vars, array_keys( $this-&gt;query_var_defaults ) ) ) );
		$last_changed = wp_cache_get_last_changed( 'comment' );

		// Fetch an entire level of the descendant tree at a time.
		$level        = 0;
		$exclude_keys = array( 'parent', 'parent__in', 'parent__not_in' );
		do {
			// Parent-child relationships may be cached. Only query for those that are not.
			$child_ids           = array();
			$uncached_parent_ids = array();
			$_parent_ids         = $levels[ $level ];
			foreach ( $_parent_ids as $parent_id ) {
				$cache_key        = &quot;get_comment_child_ids:$parent_id:$key:$last_changed&quot;;
				$parent_child_ids = wp_cache_get( $cache_key, 'comment' );
				if ( false !== $parent_child_ids ) {
					$child_ids = array_merge( $child_ids, $parent_child_ids );
				} else {
					$uncached_parent_ids[] = $parent_id;
				}
			}

			if ( $uncached_parent_ids ) {
				// Fetch this level of comments.
				$parent_query_args = $this-&gt;query_vars;
				foreach ( $exclude_keys as $exclude_key ) {
					$parent_query_args[ $exclude_key ] = '';
				}
				$parent_query_args['parent__in']    = $uncached_parent_ids;
				$parent_query_args['no_found_rows'] = true;
				$parent_query_args['hierarchical']  = false;
				$parent_query_args['offset']        = 0;
				$parent_query_args['number']        = 0;

				$level_comments = get_comments( $parent_query_args );

				// Cache parent-child relationships.
				$parent_map = array_fill_keys( $uncached_parent_ids, array() );
				foreach ( $level_comments as $level_comment ) {
					$parent_map[ $level_comment-&gt;comment_parent ][] = $level_comment-&gt;comment_ID;
					$child_ids[]                                    = $level_comment-&gt;comment_ID;
				}

				$data = array();
				foreach ( $parent_map as $parent_id =&gt; $children ) {
					$cache_key          = &quot;get_comment_child_ids:$parent_id:$key:$last_changed&quot;;
					$data[ $cache_key ] = $children;
				}
				wp_cache_set_multiple( $data, 'comment' );
			}

			$level++;
			$levels[ $level ] = $child_ids;
		} while ( $child_ids );

		// Prime comment caches for non-top-level comments.
		$descendant_ids = array();
		for ( $i = 1, $c = count( $levels ); $i &lt; $c; $i++ ) {
			$descendant_ids = array_merge( $descendant_ids, $levels[ $i ] );
		}

		_prime_comment_caches( $descendant_ids, $this-&gt;query_vars['update_comment_meta_cache'] );

		// Assemble a flat array of all comments + descendants.
		$all_comments = $comments;
		foreach ( $descendant_ids as $descendant_id ) {
			$all_comments[] = get_comment( $descendant_id );
		}

		// If a threaded representation was requested, build the tree.
		if ( 'threaded' === $this-&gt;query_vars['hierarchical'] ) {
			$threaded_comments = array();
			$ref               = array();
			foreach ( $all_comments as $k =&gt; $c ) {
				$_c = get_comment( $c-&gt;comment_ID );

				// If the comment isn't in the reference array, it goes in the top level of the thread.
				if ( ! isset( $ref[ $c-&gt;comment_parent ] ) ) {
					$threaded_comments[ $_c-&gt;comment_ID ] = $_c;
					$ref[ $_c-&gt;comment_ID ]               = $threaded_comments[ $_c-&gt;comment_ID ];

					// Otherwise, set it as a child of its parent.
				} else {

					$ref[ $_c-&gt;comment_parent ]-&gt;add_child( $_c );
					$ref[ $_c-&gt;comment_ID ] = $ref[ $_c-&gt;comment_parent ]-&gt;get_child( $_c-&gt;comment_ID );
				}
			}

			// Set the 'populated_children' flag, to ensure additional database queries aren't run.
			foreach ( $ref as $_ref ) {
				$_ref-&gt;populated_children( true );
			}

			$comments = $threaded_comments;
		} else {
			$comments = $all_comments;
		}

		return $comments;
	}

	/**
	 * Used internally to generate an SQL string for searching across multiple columns.
	 *
	 * @since 3.1.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string   $search  Search string.
	 * @param string[] $columns Array of columns to search.
	 * @return string Search SQL.
	 */
	protected function get_search_sql( $search, $columns ) {
		global $wpdb;

		$like = '%' . $wpdb-&gt;esc_like( $search ) . '%';

		$searches = array();
		foreach ( $columns as $column ) {
			$searches[] = $wpdb-&gt;prepare( &quot;$column LIKE %s&quot;, $like );
		}

		return ' AND (' . implode( ' OR ', $searches ) . ')';
	}

	/**
	 * Parse and sanitize 'orderby' keys passed to the comment query.
	 *
	 * @since 4.2.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $orderby Alias for the field to order by.
	 * @return string|false Value to used in the ORDER clause. False otherwise.
	 */
	protected function parse_orderby( $orderby ) {
		global $wpdb;

		$allowed_keys = array(
			'comment_agent',
			'comment_approved',
			'comment_author',
			'comment_author_email',
			'comment_author_IP',
			'comment_author_url',
			'comment_content',
			'comment_date',
			'comment_date_gmt',
			'comment_ID',
			'comment_karma',
			'comment_parent',
			'comment_post_ID',
			'comment_type',
			'user_id',
		);

		if ( ! empty( $this-&gt;query_vars['meta_key'] ) ) {
			$allowed_keys[] = $this-&gt;query_vars['meta_key'];
			$allowed_keys[] = 'meta_value';
			$allowed_keys[] = 'meta_value_num';
		}

		$meta_query_clauses = $this-&gt;meta_query-&gt;get_clauses();
		if ( $meta_query_clauses ) {
			$allowed_keys = array_merge( $allowed_keys, array_keys( $meta_query_clauses ) );
		}

		$parsed = false;
		if ( $this-&gt;query_vars['meta_key'] === $orderby || 'meta_value' === $orderby ) {
			$parsed = &quot;$wpdb-&gt;commentmeta.meta_value&quot;;
		} elseif ( 'meta_value_num' === $orderby ) {
			$parsed = &quot;$wpdb-&gt;commentmeta.meta_value+0&quot;;
		} elseif ( 'comment__in' === $orderby ) {
			$comment__in = implode( ',', array_map( 'absint', $this-&gt;query_vars['comment__in'] ) );
			$parsed      = &quot;FIELD( {$wpdb-&gt;comments}.comment_ID, $comment__in )&quot;;
		} elseif ( in_array( $orderby, $allowed_keys, true ) ) {

			if ( isset( $meta_query_clauses[ $orderby ] ) ) {
				$meta_clause = $meta_query_clauses[ $orderby ];
				$parsed      = sprintf( 'CAST(%s.meta_value AS %s)', esc_sql( $meta_clause['alias'] ), esc_sql( $meta_clause['cast'] ) );
			} else {
				$parsed = &quot;$wpdb-&gt;comments.$orderby&quot;;
			}
		}

		return $parsed;
	}

	/**
	 * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
	 *
	 * @since 4.2.0
	 *
	 * @param string $order The 'order' query variable.
	 * @return string The sanitized 'order' query variable.
	 */
	protected function parse_order( $order ) {
		if ( ! is_string( $order ) || empty( $order ) ) {
			return 'DESC';
		}

		if ( 'ASC' === strtoupper( $order ) ) {
			return 'ASC';
		} else {
			return 'DESC';
		}
	}
}
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