WP_Comment_Query::parse_orderby( string $orderby ): string|false

Source

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->query_vars['meta_key'] ) ) {
		$allowed_keys[] = $this->query_vars['meta_key'];
		$allowed_keys[] = 'meta_value';
		$allowed_keys[] = 'meta_value_num';
	}

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

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

	return $parsed;
}

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