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Hey,
Just a quick question, this time: does anyone know what the exact limitations are when I collect someone's IP with $_SERVER['REMOTE_ADDR']?
For example:
- What is the maximum length?
- What characters could be in it? (Only numers and periods, or other characters as well?)
I was wondering about this while setting up a table for a database. The table will contain data of registered users: id, name, password, ip, etc.
Any tips?
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CommentAuthorkari.patila
- CommentTimeSep 21st 2007
According to Wikipedia, an IPv6 address looks like this (each line being the same address):
2001:0db8:0000:0000:0000:0000:1428:57ab
2001:0db8:0000:0000:0000::1428:57ab
2001:0db8:0:0:0:0:1428:57ab
2001:0db8:0:0::1428:57ab
2001:0db8::1428:57ab
2001:db8::1428:57ab
Do you really need to set exact limitations?
Here's a function that I use instead of just getting the REMOTE_ADDR:
function GetRealIP() {
$check = array('HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED','HTTP_VIA', 'HTTP_X_COMING_FROM', 'HTTP_COMING_FROM', 'HTTP_CLIENT_IP', 'REMOTE_ADDR');
$length = count($check);
for($i=0; $i<$length; $i++) {
$item = $check[$i];
if($found = $_SERVER[$item]) return $found;
}
}
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$_SERVER['REMOTE_ADDR'] always returns it in the format x.x.x.x, only numbers, always 3 periods.
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- CommentAuthorJackinloadup
- CommentTimeOct 28th 2007
i would suggest using maybe char(15). That should have all the space needed for holding an IPv4 address at its full length 'xxx.xxx.xxx.xxx' I havent tested this though. i would love to hear any responses to this data type, and see if it works as it should.
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