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[RESOLVED] Better IP Aquisition?

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Apr 13.2010

I wrote this to check for HTTP Forwarded (Proxy) but I know there
are better ways to get an IP. This one doesn’t seem very thorough,
and I’ll be GeoLocating IP’s based of it so would like to get the best
example I can find. Thanks Ahead guys.

[code=php]
 if (getenv(HTTP_X_FORWARDED_FOR)){
$ip = @getenv(“HTTP_X_FORWARDED_FOR”);
explode(“,”,$ip);
trim($ip[sizeof($ip)-1]);
}

else {$ip = getenv(REMOTE_ADDR);}
[/code]

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PHP

2 Comments(s) ↴

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@SrWebDeveloperApr 13.2010 — I've seen folks use this variation which approaches it logically:

[code=php]function getIP() {
$ip;
if (getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP");
else if(getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if(getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "UNKNOWN";
return $ip;

} [/code]

Note: Use $_SERVER['blah'] instead of getenv("blah") if you run an ASAPI server, i.e. IIS. Above function is common for *nix. The advantage of getenv() over using $_SERVER outright is simply that it returns false on error, useful in functions like the one above, FYI. By no means the only way, isset($_SERVER["blah"]) works too!

-jim
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@ehimeauthorApr 13.2010 — Thanks Jim, that should work great. I'm running Linux, so should be no conflicts
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