Extract the "most valid" ip-address from the client-request, then uses a `GEO-IP` service to fetch its information .

inspectUserLocation.php

<?php
    /*
     *  Extract the "most valid" ip-address from the client-request
     *  then uses a `GEO-IP` service to fetch its information .
     *  
     *  To extract the "most valid" ip-address, it loops over all http-headers
     *  from the client-request, then gets the ip that matches this pattern
     *  "^([0-9]+){3}\.([0-9]+){3}\.([0-9]+){3}\.([0-9]+){3}$"
     *  this is done becaouse each proxy server "may" send a http-header
     *  i.e: "HTTP_X_FORWARDED_FOR", "HTTP_VIA" ... etc .
     *
     *  @author   Mohammed Al Ashaal "<alash3al@{fb, github}, m7medalash3al@twitter>"
     *  @license  MIT License
     *  @return   stdClass
     *  @uses     "www.telize.com" geo-ip api
     *  @example  `print "<pre>" . print_r(inspectUserLocation(), 1) . "</pre>";`
     */
    function inspectUserLocation()
    {
        // just a shortcut
        $s = &$_SERVER;

        // the default ip address
        $ip = $s['REMOTE_ADDR'];

        // don't use it on localhost
        if ( $ip == '127.0.0.1' ) {
            throw new Exception("Don't use me on localhost :)");
        }

        // extract all http-ip-address that passed by any proxy
        foreach ( $s as $k => $v ) {
            if ( (stripos($k, "http_") !== false) && (preg_match("/^([0-9]+){3}\.([0-9]+){3}\.([0-9]+){3}\.([0-9]+){3}$/", $v)) ) {
                $ip = $v;
                break;
            }
        }

        // done
        return json_decode(file_get_contents(sprintf("http://www.telize.com/geoip/%s", $ip)));
    }

Example

<?php

print "<pre>" . print_r(inspectUserLocation(), 1) . "</pre>";

Result

stdClass Object
(
    [dma_code] => 0
    [ip] => 62.210.94.133
    [asn] => AS12876
    [latitude] => 48.86
    [country_code] => FR
    [offset] => 2
    [country] => France
    [isp] => ONLINE S.A.S.
    [timezone] => Europe/Paris
    [area_code] => 0
    [continent_code] => EU
    [longitude] => 2.35
    [country_code3] => FRA
)