IPv6::split_v6_v4( string $ip ): SimplePie\Net\array{string,

140    private static function split_v6_v4(string $ip): array141    {142        if (strpos($ip, '.') !== false) {143            $pos = strrpos($ip, ':');144            assert($pos !== false, 'For PHPStan: IPv6 address must contain colon, since split_v6_v4 is only ever called after uncompress.');145            $ipv6_part = substr($ip, 0, $pos);146            $ipv4_part = substr($ip, $pos + 1);147            return [$ipv6_part, $ipv4_part];148        }149 150        return [$ip, ''];151    }