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PHPでIPv6か判定
filter_var($_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ? 'IPv6' : 'IPv4'; PHPでIPv6か判定
https://blog.teraren.com/posts/php-ipv6-ipv4/ filter_var($_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ? 'IPv6' : 'IPv4';