Geocoder.us user Kenny Wickstrom wrote this SOAP sample. Thanks Kenny!
// Tested with PHP 5.2.4
// The address to convert
$address = '1600 Pennsylvania Av, Washington, DC';
printf("Get geocode for address: %s\n",$address);
// Chose your method, with or without user info
$wsdl = 'http://geocoder.us/dist/eg/clients/GeoCoderPHP.wsdl';
//$wsdl = 'http://username:password@geocoder.us/dist/eg/clients/GeoCoderPHP.wsdl';
// Make the connection
$client = new SoapClient($wsdl);
// Use this to see what services are available
//var_dump($client->__getFunctions());
// Actually call the service
$result = $client->geocode($address);
var_dump($result);