wpdb::get_blog_prefix( int $blog_id = null ): string

1079	public function get_blog_prefix( $blog_id = null ) {1080		if ( is_multisite() ) {1081			if ( null === $blog_id ) {1082				$blog_id = $this->blogid;1083			}1084 1085			$blog_id = (int) $blog_id;1086 1087			if ( defined( 'MULTISITE' ) && ( 0 === $blog_id || 1 === $blog_id ) ) {1088				return $this->base_prefix;1089			} else {1090				return $this->base_prefix . $blog_id . '_';1091			}1092		} else {1093			return $this->base_prefix;1094		}1095	}