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The geocoder.us Web service is quite flexible, offering three different interfaces: REST, SOAP, and XML-RPC. For purposes of this exercise, we'll be taking advantage of SOAP using PHP's SOAP extension, available as of version 5.0. If version 5.0 or newer isn't available to you, consider using NuSOAP, a PHP-driven Web services toolkit written by Dietrich Ayala and maintained by Scott Nichol.