Gravity Wiz: Geo IP

gistfile1.php

<?php
/**
* Gravity Wiz Geo IP
*
* Allows the use of the {geoip} merge tag in the dynamic population parameter of any single input field.
* Additionally, provides ability to populate specific properties from the geo data as follows:
*
*   :city           Virginia Beach
*   :region_code    VA
*   :region_name    Virginia
*   :metrocode      544
*   :zipcode        23462
*   :longitude      -76.1464
*   :latitude       36.8372
*   :country_code   US
*   :ip             74.110.104.59
*   :country_name   United States
*
* Any of the following filters can be used like so:
*
*   {geoip:city}
*
*/
class GWGeoIP {

    public static $geo_data;

    public static function init() {
        add_filter('gform_pre_submission', array('GWGeoIP', 'replace_merge_tag'), 9);
    }

    public static function replace_merge_tag($form) {

        foreach($form['fields'] as $field) {

            preg_match_all('/{geoip(:(.+))?}/mi', rgar($field, 'inputName'), $matches, PREG_SET_ORDER);
            if(!empty($matches)) {

                $data = self::get_geo_data();

                list($merge_tag,,$property) = array_pad($matches[0], 3, '');

                if($property) {
                    $_POST["input_{$field['id']}"] = $data->$property;
                } else {
                    $_POST["input_{$field['id']}"] = "{$data->city}, {$data->region_name} {$data->zipcode}";
                }

            }

        }

    }

    public static function get_ip() {
        $ip = RGFormsModel::get_ip();
        return $ip != '127.0.0.1' ? $ip : '74.110.104.59';
    }

    public static function get_geo_data() {

        if(empty(self::$geo_data)) {
            $geo_data = json_decode( wp_remote_retrieve_body( wp_remote_get( 'http://freegeoip.net/json/' . self::get_ip() ) ) );
        } else {
            $geo_data = self::$geo_data;
        }

        return $geo_data;
    }

}

GWGeoIP::init();