Geocoder

Geocoder is a library which helps you build geo-aware applications. It provides an abstraction layer for geocoding manipulations. The library is splitted in two parts: HttpAdapter and Provider and is really extensible.

HttpAdapters

HttpAdapters are responsible to get data from remote APIs.

Currently, there are the following adapters:

• BuzzHttpAdapter for Buzz, a lightweight PHP 5.3 library for issuing HTTP requests;
• CurlHttpAdapter for cURL;
• GuzzleHttpAdapter for Guzzle, PHP 5.3+ HTTP client and framework for building RESTful web service clients;
• ZendHttpAdapter for Zend Http Client.

Providers

Providers contain the logic to extract useful information.

Currently, there are many providers for the following APIs:

• FreeGeoIp as IP-Based geocoding provider;
• HostIp as IP-Based geocoding provider;
• IpInfoDB as IP-Based geocoding provider;
• Yahoo! PlaceFinder as Address-Based geocoding and reverse geocoding provider;
• Google Maps as Address-Based geocoding and reverse geocoding provider;
• Bing Maps as Address-Based geocoding and reverse geocoding provider;
• OpenStreetMaps as Address-Based geocoding and reverse geocoding provider;
• CloudMade as Address-Based geocoding and reverse geocoding provider;
• Geoip, the PHP extension, as IP-Based geocoding provider.

Installation

The recommended way to install Geocoder is through composer.

Just create a composer.json file for your project:

{
    "require": {
        "willdurand/geocoder": "*"
    }
}

And run these two commands to install it:

$ wget http://getcomposer.org/composer.phar
$ php composer.phar install

Now you can add the autoloader, and you will have access to the library:

<?php

require 'vendor/.composer/autoload.php';

If you don't use neither Composer nor a ClassLoader in your application, just require the provided autoloader:

<?php

require_once 'src/autoload.php';

You're done.

Usage

First, you need an adapter to query an API:

<?php

$adapter  = new \Geocoder\HttpAdapter\BuzzHttpAdapter();

The BuzzHttpAdapter is tweakable, actually you can pass a Browser object to this adapter:

<?php

$buzz    = new \Buzz\Browser(new \Buzz\Client\Curl());
$adapter = new \Geocoder\HttpAdapter\BuzzHttpAdapter($buzz);

Now, you have to choose a provider which is closed to what you want to get.

FreeGeoIpProvider

The FreeGeoIpProvider is able to geocode IP addresses only.

HostIpProvider

The HostIpProvider is able to geocode IP addresses only.

IpInfoDbProvider

The IpInfoDbProvider is able to geocode IP addresses only.

YahooProvider

The YahooProvider is able to geocode both IP addresses and street addresses. This provider can also reverse information based on coordinates (latitude, longitude).

GoogleMapsProvider

The GoogleMapsProvider is able to geocode and reverse geocode street addresses.

BingMapsProvider

The BingMapsProvider is able to geocode and reverse geocode street addresses.

OpenStreetMapsProvider

The OpenStreetMapsProvider is able to geocode and reverse geocode street addresses.

CloudMadeProvider

The CloudMadeProvider is able to geocode and reverse geocode street addresses.

GeoipProvider

The GeoipProvider is able to geocode IP addresses only. No need to use an HttpAdapter as it uses a local database. See the MaxMind page for more information.

You can use one of them or write your own provider. You can also register all providers and decide later. That's we'll do:

<?php

$geocoder = new \Geocoder\Geocoder();
$geocoder->registerProviders(array(
    new \Geocoder\Provider\YahooProvider(
        $adapter, '<YAHOO_API_KEY>', $locale
    ),
    new \Geocoder\Provider\IpInfoDbProvider(
        $adapter, '<IPINFODB_API_KEY>'
    ),
    new \Geocoder\Provider\HostIpProvider($adapter)
));

The $locale parameter is available for the YahooProvider.

Everything is ok, enjoy!

API

The main method is called geocode() which receives a value to geocode. It can be an IP address or a street address (partial or not).

<?php

$result = $geocoder->geocode('88.188.221.14');
// Result is:
// "latitude"       => string(9) "47.901428"
// "longitude"      => string(8) "1.904960"
// "bounds"         => array(4) {
//     "south" => string(9) "47.813320"
//     "west"  => string(8) "1.809770"
//     "north" => string(9) "47.960220"
//     "east"  => string(8) "1.993860"
// }
// "streetNumber"   => string(0) ""
// "streetName"     => string(0) ""
// "city"           => string(7) "Orleans"
// "zipcode"        => string(0) ""
// "county"         => string(6) "Loiret"
// "region"         => string(6) "Centre"
// "country"        => string(6) "France"

$result = $geocoder->geocode('10 rue Gambetta, Paris, France');
// Result is:
// "latitude"       => string(9) "48.863217"
// "longitude"      => string(8) "2.388821"
// "bounds"         => array(4) {
//     "south" => string(9) "48.863217"
//     "west"  => string(8) "2.388821"
//     "north" => string(9) "48.863217"
//     "east"  => string(8) "2.388821"
// }
// "streetNumber"   => string(2) "10"
// "streetName"     => string(15) "Avenue Gambetta"
// "city"           => string(5) "Paris"
// "county"         => string(5) "Paris"
// "zipcode"        => string(5) "75020"
// "region"         => string(14) "Ile-de-France"
// "country"        => string(6) "France"

The geocode() method returns a Geocoded result object with the following API, this object also implements the ArrayAccess interface:

• getCoordinates() will return an array with latitude and longitude values;
• getLatitude() will return the latitude value;
• getLongitude() will return the longitude value;
• getBounds() will return an array with south, west, north and east values;
• getStreetNumber() will return the street number/house number value;
• getStreetName() will return the street name value;
• getCity() will return the city;
• getZipcode() will return the zipcode;
• getCounty() will return the county;
• getRegion() will return the region;
• getCountry() will return the country;
• getCountryCode() will return the ISO country code.

The Geocoder's API is fluent, you can write:

<?php

$result = $geocoder
    ->registerProvider(new \My\Provider\Custom($adapter))
    ->using('custom')
    ->geocode('68.145.37.34')
    ;

The using() method allows you to choose the adapter to use. When you deal with multiple adapters, you may want to choose one of them. The default behavior is to use the first one but it can be annoying.

Reverse Geocoding

This library provides a reverse() method to retrieve information from coordinates:

$result = $geocoder->reverse($latitude, $longitude);

Note: the YahooProvider bundled in this lib is the unique provider able to do this feature.

Dumpers

Geocoder provides dumpers that aim to transform a ResultInterface object in standard formats.

GPS eXchange Format (GPX)

The GPS eXchange format is designed to share geolocated data like point of interests, tracks, ways, but also coordinates. Geocoder provides a dumper to convert a ResultInterface object in an GPX compliant format.

Assuming we got a $result object as seen previously:

<?php

$dumper = new \Geocoder\Dumper\GpxDumper();
$strGpx = $dumper->dump($result);

echo $strGpx;

It will display:

<gpx
    version="1.0"
    creator="Geocoder" version="1.0.1-dev"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.topografix.com/GPX/1/0"
    xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd">
    <bounds minlat="2.388911" minlon="48.863151" maxlat="2.388911" maxlon="48.863151"/>
    <wpt lat="48.8631507" lon="2.3889114">
        <name><![CDATA[Paris]]></name>
        <type><![CDATA[Address]]></type>
    </wpt>
</gpx>

GeoJSON

GeoJSON is a format for encoding a variety of geographic data structures.

Keyhole Markup Language (KML)

Keyhole Markup Language is an XML notation for expressing geographic annotation and visualization within Internet-based, two-dimensional maps and three-dimensional Earth browsers.

Well-Known Binary (WKB)

The Well-Known Binary (WKB) representation for geometric values is defined by the OpenGIS specification.

Well-Known Text (WKT)

Well-known text (WKT) is a text markup language for representing vector geometry objects on a map, spatial reference systems of spatial objects and transformations between spatial reference systems.

Extending Things

You can provide your own adapter, you just need to create a new class which implements HttpAdapterInterface.

You can also write your own provider by implementing the ProviderInterface.

Note, the AbstractProvider class can help you by providing useful features.

You can provide your own dumper by implementing the DumperInterface.

Unit Tests

To run unit tests, you'll need a set of dependencies you can install by running the install_vendors.sh script:

./bin/install_vendors.sh

Once installed, just launch the following command:

phpunit

You'll obtain some skipped unit tests due to the need of API keys.

Rename the phpunit.xml.dist file to phpunit.xml, then uncomment the following lines and add your own API keys:

<php>
    <!-- <server name="IPINFODB_API_KEY" value="YOUR_API_KEY" /> -->
    <!-- <server name="YAHOO_API_KEY" value="YOUR_API_KEY" /> -->
    <!-- <server name="BINGMAPS_API_KEY" value="YOUR_API_KEY" /> -->
    <!-- <server name="CLOUDMADE_API_KEY" value="YOUR_API_KEY" /> -->
</php>

You're done.

Credits

• William Durand william.durand1@gmail.com
• All contributors

License

Geocoder is released under the MIT License. See the bundled LICENSE file for details.