Google Maps Geolocation

gistfile1.php

<?php
/**
 * GoogleGeo
 *
 * Google maps geolocation, to find coordinates of a location
 * @author J. Miller
 */
class GoogleGeo {

	// GoogleMaps API Key
	// http://www.google.com/apis/maps/signup.html
	private $apiKey = GOOGLE_MAPS_API_KEY;

	private $apiURL = 'http://maps.google.com/maps/geo?q={address}&key={key}';

	private $address = '';

/**
 * Constructor
 *
 * @param string $address (optional) Address to search for
 * @return void
 */
	public function __construct($address = '') {
		$this->address = $address;
	}

/**
 * Get details about a location
 *
 * @param string $address Location to search for. Enter as much information as possible.
 * @return false|array Location found
 *     latitude
 *     longitude
 *     address
 *     state
 *     country
 */
	public function getLocationFromAddress($address = null) {
		if (!$address) {
			$address = $this->address;
			if (!$address) {
				throw new Exception('Missing address.');
			}
		}

		// Create API URL
		$url = $this->apiURL;
		$url = str_replace('{address}', urlencode($address), $url);
		$url = str_replace('{key}', $this->apiKey, $url);

		// Get response from API
		$response = json_decode(file_get_contents($url));

		if ($response->Status->code == 200) {
			// Received a location

			$location = array(
				'latitude' =>  $response->Placemark[0]->Point->coordinates[1],
				'longitude' => $response->Placemark[0]->Point->coordinates[0],
				'address' =>   $response->Placemark[0]->address,
				'state' =>     $response->Placemark[0]->AddressDetails->Country->AdministrativeArea->AdministrativeAreaName,
				'country' =>   $response->Placemark[0]->AddressDetails->Country->CountryNameCode
			);

			if (isset($response->Placemark[0]->AddressDetails->Country->AdministrativeArea->SubAdministrativeArea)) {
				$location['city'] = $response->Placemark[0]->AddressDetails->Country->AdministrativeArea->SubAdministrativeArea->Locality->LocalityName;
				$location['zip'] =  $response->Placemark[0]->AddressDetails->Country->AdministrativeArea->SubAdministrativeArea->Locality->PostalCode->PostalCodeNumber;
			} else {
				$location['city'] = $response->Placemark[0]->AddressDetails->Country->AdministrativeArea->Locality->LocalityName;
				$location['zip'] =  $response->Placemark[0]->AddressDetails->Country->AdministrativeArea->Locality->PostalCode->PostalCodeNumber;
			}

			return $location;
		}

		return false;
	}

}