IRI::set_authority( string|null $authority, bool $clear_cache = false ): bool

771    public function set_authority(?string $authority, bool $clear_cache = false)772    {773        static $cache;774        if ($clear_cache) {775            $cache = null;776            return false;777        }778        if (!$cache) {779            $cache = [];780        }781 782        if ($authority === null) {783            $this->iuserinfo = null;784            $this->ihost = null;785            $this->port = null;786            return true;787        } elseif (isset($cache[$authority])) {788            [789                $this->iuserinfo,790                $this->ihost,791                $this->port,792                $return793            ] = $cache[$authority];794 795            return $return;796        }797 798        $remaining = $authority;799        if (($iuserinfo_end = strrpos($remaining, '@')) !== false) {800            // Cast for PHPStan on PHP < 8.0. It does not detect that801            // the range is not flipped so substr cannot return false.802            $iuserinfo = (string) substr($remaining, 0, $iuserinfo_end);803            $remaining = substr($remaining, $iuserinfo_end + 1);804        } else {805            $iuserinfo = null;806        }807        if (($port_start = strpos($remaining, ':', intval(strpos($remaining, ']')))) !== false) {808            $port = substr($remaining, $port_start + 1);809            if ($port === false) {810                $port = null;811            }812            $remaining = substr($remaining, 0, $port_start);813        } else {814            $port = null;815        }816 817        $return = $this->set_userinfo($iuserinfo) &&818                  $this->set_host($remaining) &&819                  $this->set_port($port);820 821        $cache[$authority] = [822            $this->iuserinfo,823            $this->ihost,824            $this->port,825            $return826        ];827 828        return $return;829    }