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Free address lookup API based on postcode?

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Questions in the title really, has anyone heard of one?

 

There are many free geolocation services out there, One notably maxmind's services, You can filter the database yourself or use said software to get the lookup.

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// First, we need to take their postcode and get the lat/lng pair:
$postcode = $_REQUEST['postcode'];
// Sanitize their postcode:
$search_code = urlencode($postcode);
$url = 'http://maps.googleapis.com/maps/api/geocode/json?address=' . $search_code . '&sensor=false';
$json = json_decode(file_get_contents($url));
$lat = $json->results[0]->geometry->location->lat;
$lng = $json->results[0]->geometry->location->lng;
// Now build the lookup:
$address_url = 'http://maps.googleapis.com/maps/api/geocode/json?latlng=' . $lat . ',' . $lng . '&sensor=false';
$address_json = json_decode(file_get_contents($address_url));
$address_data = $address_json->results[0]->address_components;
$street = str_replace('Dr', 'Drive', $address_data[1]->long_name);
$town = $address_data[2]->long_name;
$county = $address_data[3]->long_name;
$city = $address_data[4]->long_name;
$country = $address_data[5]->long_name;
$array = array('street' => $street, 'town' => $town, 'city' => $city, 'country' => $country);
//echo json_encode($array);
echo $array = implode(", ",$array);

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