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copied!<p>Firstly let me clarify a few things up.</p> <p>When your on localhost your not using your ISP To fetch a webpage, thus you would use an internal ip of <code>127.0.0.1</code> or <code>::1</code> for ipv6.</p> <p>If your fetching the page from over a local network via a router of some kind, you will have an ip assigned by the router such as <code>192.168.1.90</code></p> <p>if your site is hosted outside the network then you ask your ISP to fetch the site for you, meaning you get use the IP specified by whatsmyip.</p> <p>if your using a DNS Server such as Opendns then your asking your ISP to ask Opendns to fetch the site for you, and open dns uses a set of ip's that are different to yours for obvious reasons.</p> <p>there may be some sort of proxy that may be interfering, so what you should do is counter for that, a standard proxy site should forward the clients IP on to the server incase of any direct connections required and for several other reasons.</p> <p>This being said you can usually find the IP by checking several other params before you check <code>REMOTE_ADDR</code>, here is a class I have created for one of my projects but you can just take what you need:</p> <p><a href="https://github.com/AdminSpot/ASDDL/blob/master/system/classes/http/request.php" rel="nofollow">https://github.com/AdminSpot/ASDDL/blob/master/system/classes/http/request.php</a></p> <pre><code>foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key) { if (array_key_exists($key, $_SERVER) === true) { foreach (explode(',', $_SERVER[$key]) as $ip) { if (filter_var($ip, FILTER_VALIDATE_IP) !== false) { $this->ip = $ip; break; } } } } </code></pre> <p>As you can see the order of the array is very important:</p> <ul> <li>HTTP_CLIENT_IP</li> <li>HTTP_X_FORWARDED_FOR</li> <li>HTTP_X_FORWARDED</li> <li>HTTP_X_CLUSTER_CLIENT_IP</li> <li>HTTP_FORWARDED_FOR</li> <li>HTTP_FORWARDED</li> <li>REMOTE_ADDR</li> </ul> <p>notice the <code>REMOTE_ADDR</code> comes last, this is because this is the last resort and most of the time is incorrect.</p>

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