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Posted by Aaron Saray on 09/09/07 14:14
On Sep 8, 11:04 am, "J.O. Aho" <u...@example.net> wrote:
> Rob wrote:
> > Just wondering how sites capture a visitor's IP address and how this is
> > done in PHP?
>
> There is a page which lists PHP global variables, these are useful to know,http://www.php.net/manual/en/reserved.variables.php
>
> As you see $_SERVER['REMOTE_ADDR'] will hold the remote users IP-address (if
> the remote user is using a proxy, then it's the proxy IP-address you get).
>
> So in your code you can use:
>
> <?PHP
> $userip=$_SERVER['REMOTE_ADDR'];
>
> echo "This is your ip-number: {$userip}<br>";
>
> //File we want to store the ip-number to
> //se to have this file already.
> $filename = 'storeipnumbers.txt';
> if (is_writable($filename)) {
> if (!$handle = fopen($filename, 'a')) {
> echo "Cannot open file ($filename)";
> exit;
> }
> if (fwrite($handle, $userip) === FALSE) {
> echo "Cannot write to file ($filename)";
> exit;
> }
> fclose($handle);
> echo "We have stored ip-number '{$userip}' to file '{$filename}'";} else {
>
> echo "Sorry, we couldn't store the following ip-number: {$userip}<br>";}
>
> ?>
>
> This script displays the ip-number and stores it to a file called
> storeipnumbers.txt.
> --
>
> //Aho
Users can also have a proxied IP address. This is what I use to
figure out the IP addresses (its from a class - hence $this):
/**
* Get user ip
*
* Get user's ip and also proxy if it exists.
*/
protected function _getIP()
{
/**
* Check for http forwarding proxy
*/
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) || !
empty($_SERVER['HTTP_CLIENT_IP'])) {
/**
* REMOTE_ADDR would be the proxy IP
*/
if (!empty($_SERVER['REMOTE_ADDR'])) {
$this->_proxyIP = $_SERVER['REMOTE_ADDR'];
}
/**
* HTTP_X_FORWARDED_FOR would be the user's ip.
*/
if (empty($_SERVER['HTTP_X_FORWARDED_FOR']) &&
empty($_SERVER['HTTP_CLIENT_IP'])) {
/**
* not set, so set our user ip to our proxy's ip as
well (or all NULL even)
*/
$this->_userIP = $this->_proxyIP;
}
/**
* get our proxy ip
*/
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$this->_userIP = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
elseif (!empty($_SERVER['HTTP_CLIENT_IP'])) {
$this->_userIP = $_SERVER['HTTP_CLIENT_IP'];
}
}
/**
* not proxied
*/
else {
/**
* if we can detect ip
*/
if (isset($_SERVER['REMOTE_ADDR'])) {
$this->_userIP = $_SERVER['REMOTE_ADDR'];
}
}
}
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