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geoplugin.com has a free php class that works pretty good

just save this as geoplugin.class.php

Code:

<?php

/*

This PHP class is free software: you can redistribute it and/or modify

the code under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version. 



However, the license header, copyright and author credits 

must not be modified in any form and always be displayed.



This class is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.



@author geoPlugin ([email protected])

@copyright Copyright geoPlugin ([email protected])

$version 1.01





This PHP class uses the PHP Webservice of http://www.geoplugin.com/ to geolocate IP addresses



Geographical location of the IP address (visitor) and locate currency (symbol, code and exchange rate) are returned.



See http://www.geoplugin.com/webservices/php for more specific details of this free service



*/



class geoPlugin {

        

        //the geoPlugin server

        var $host = 'http://www.geoplugin.net/php.gp?ip={IP}&base_currency={CURRENCY}';

                

        //the default base currency

        var $currency = 'USD';

        

        //initiate the geoPlugin vars

        var $ip = null;

        var $city = null;

        var $region = null;

        var $areaCode = null;

        var $dmaCode = null;

        var $countryCode = null;

        var $countryName = null;

        var $continentCode = null;

        var $latitute = null;

        var $longitude = null;

        var $currencyCode = null;

        var $currencySymbol = null;

        var $currencyConverter = null;

        

        function geoPlugin() {



        }

        

        function locate($ip = null) {

                

                global $_SERVER;

                

                if ( is_null( $ip ) ) {

                        $ip = $_SERVER['REMOTE_ADDR'];

                }

                

                $host = str_replace( '{IP}', $ip, $this->host );

                $host = str_replace( '{CURRENCY}', $this->currency, $host );

                

                $data = array();

                

                $response = $this->fetch($host);

                

                $data = unserialize($response);

                

                //set the geoPlugin vars

                $this->ip = $ip;

                $this->city = $data['geoplugin_city'];

                $this->region = $data['geoplugin_region'];

                $this->areaCode = $data['geoplugin_areaCode'];

                $this->dmaCode = $data['geoplugin_dmaCode'];

                $this->countryCode = $data['geoplugin_countryCode'];

                $this->countryName = $data['geoplugin_countryName'];

                $this->continentCode = $data['geoplugin_continentCode'];

                $this->latitude = $data['geoplugin_latitude'];

                $this->longitude = $data['geoplugin_longitude'];

                $this->currencyCode = $data['geoplugin_currencyCode'];

                $this->currencySymbol = $data['geoplugin_currencySymbol'];

                $this->currencyConverter = $data['geoplugin_currencyConverter'];

                

        }

        

        function fetch($host) {



                if ( function_exists('curl_init') ) {

                                                

                        //use cURL to fetch data

                        $ch = curl_init();

                        curl_setopt($ch, CURLOPT_URL, $host);

                        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

                        curl_setopt($ch, CURLOPT_USERAGENT, 'geoPlugin PHP Class v1.0');

                        $response = curl_exec($ch);

                        curl_close ($ch);

                        

                } else if ( ini_get('allow_url_fopen') ) {

                        

                        //fall back to fopen()

                        $response = file_get_contents($host, 'r');

                        

                } else {



                        trigger_error ('geoPlugin class Error: Cannot retrieve data. Either compile PHP with cURL support or enable allow_url_fopen in php.ini ', E_USER_ERROR);

                        return;

                

                }

                

                return $response;

        }

        

        function convert($amount, $float=2, $symbol=true) {

                

                //easily convert amounts to geolocated currency.

                if ( !is_numeric($this->currencyConverter) || $this->currencyConverter == 0 ) {

                        trigger_error('geoPlugin class Notice: currencyConverter has no value.', E_USER_NOTICE);

                        return $amount;

                }

                if ( !is_numeric($amount) ) {

                        trigger_error ('geoPlugin class Warning: The amount passed to geoPlugin::convert is not numeric.', E_USER_WARNING);

                        return $amount;

                }

                if ( $symbol === true ) {

                        return $this->currencySymbol . round( ($amount * $this->currencyConverter), $float );

                } else {

                        return round( ($amount * $this->currencyConverter), $float );

                }

        }

        

        function nearby($radius=10, $limit=null) {



                if ( !is_numeric($this->latitude) || !is_numeric($this->longitude) ) {

                        trigger_error ('geoPlugin class Warning: Incorrect latitude or longitude values.', E_USER_NOTICE);

                        return array( array() );

                }

                

                $host = "http://www.geoplugin.net/extras/nearby.gp?lat=" . $this->latitude . "&long=" . $this->longitude . "&radius={$radius}";

                

                if ( is_numeric($limit) )

                        $host .= "&limit={$limit}";

                        

                return unserialize( $this->fetch($host) );



        }



        

}



?>

then to use it in a php just call it like this

Code:

require_once('geoplugin.class.php');

$geoplugin = new geoPlugin();



$geoplugin->locate();

 

$city = "{$geoplugin->city}";

echo "We have detected , you live in $city";

?>