WP_Importer::get_imported_comments( string $blog_id ): array

93	public function get_imported_comments( $blog_id ) {94		global $wpdb;95 96		$hashtable = array();97 98		$limit  = 100;99		$offset = 0;100 101		// Grab all comments in chunks.102		do {103			$results = $wpdb->get_results(104				$wpdb->prepare(105					"SELECT comment_ID, comment_agent FROM $wpdb->comments LIMIT %d,%d",106					$offset,107					$limit108				)109			);110 111			// Increment offset.112			$offset = ( $limit + $offset );113 114			if ( ! empty( $results ) ) {115				foreach ( $results as $r ) {116					// Explode comment_agent key.117					list ( $comment_agent_blog_id, $source_comment_id ) = explode( '-', $r->comment_agent );118 119					$source_comment_id = (int) $source_comment_id;120 121					// Check if this comment came from this blog.122					if ( (int) $blog_id === (int) $comment_agent_blog_id ) {123						$hashtable[ $source_comment_id ] = (int) $r->comment_ID;124					}125				}126			}127		} while ( count( $results ) === $limit );128 129		return $hashtable;130	}