WP_Importer::get_imported_comments( string $blog_id ): array

94	public function get_imported_comments( $blog_id ) {95		global $wpdb;96 97		$hashtable = array();98 99		$limit  = 100;100		$offset = 0;101 102		// Grab all comments in chunks.103		do {104			$results = $wpdb->get_results(105				$wpdb->prepare(106					"SELECT comment_ID, comment_agent FROM $wpdb->comments LIMIT %d,%d",107					$offset,108					$limit109				)110			);111 112			// Increment offset.113			$offset = ( $limit + $offset );114 115			if ( ! empty( $results ) ) {116				foreach ( $results as $r ) {117					// Explode comment_agent key.118					list ( $comment_agent_blog_id, $source_comment_id ) = explode( '-', $r->comment_agent );119 120					$source_comment_id = (int) $source_comment_id;121 122					// Check if this comment came from this blog.123					if ( (int) $blog_id === (int) $comment_agent_blog_id ) {124						$hashtable[ $source_comment_id ] = (int) $r->comment_ID;125					}126				}127			}128		} while ( count( $results ) === $limit );129 130		return $hashtable;131	}