note 83548 added to function.ip2long

I had a problem with calling this function with REMOTE_ADDR on my lighttpd web server. Turned out that IPv6 was installed on this server, so even though REMOTE_ADDR was an IPv4 address, it was being formatted using IPv6's IPv4 compatibility mode. For example, 10.0.0.1 was becoming ::ffff:10.0.0.1, which caused iplong to report the address as invalid instead of parsing it correctly. The correct fix would of course be to update my infrastructure so that it's properly IPv6-compatible; but in the context of my particular situation, this would involve a lot of re-engineering. So in the meantime, I worked around the issue using this quick and dirty hack: $ip = htmlspecialchars($_SERVER['REMOTE_ADDR']); if (strpos($ip, '::') === 0) { $ip = substr($ip, strrpos($ip, ':')+1); } $host = ip2long($ip); Ugly but functional. ---- Server IP: 203.88.112.146 Probable Submitter: 203.32.87.50 ---- Manual Page -- http://www.php.net/manual/en/function.ip2long.php Edit -- https://master.php.net/note/edit/83548 Del: integrated -- https://master.php.net/note/delete/83548/integrated Del: useless -- https://master.php.net/note/delete/83548/useless Del: bad code -- https://master.php.net/note/delete/83548/bad+code Del: spam -- https://master.php.net/note/delete/83548/spam Del: non-english -- https://master.php.net/note/delete/83548/non-english Del: in docs -- https://master.php.net/note/delete/83548/in+docs Del: other reasons-- https://master.php.net/note/delete/83548 Reject -- https://master.php.net/note/reject/83548 Search -- https://master.php.net/manage/user-notes.php