gistfile1.php

<?php
namespace Vmware\Soap;

/**
 * @author Nicolas Fabre
 */
class Client extends \SoapClient {
    /**
     * Performs SOAP request over HTTP.
     * 
     * @see http://geauxvirtual.wordpress.com/2010/10/07/using-php5-soap-with-vsphere-api/
     * @param string $request The XML SOAP request.
     * @param string $location The URL to request.
     * @param string $action The SOAP action.
     * @param int $version The SOAP version.
     * @param int $one_way If one_way is set to 1, this method returns nothing. Use this where a response is not expected.
     * @return string The XML SOAP response
     */
    public function __doRequest($request,$location,$action, $version, $one_way=0) {
    /**
     * PHP5 SOAP function sets the type of the SOAP message as "xsi:type".  
     * The vSphere API expects a type of just "type"
     */
        $request = str_replace("xsi:", "", $request);
	return parent::__doRequest($request, $location, $action, $version);	
    }	
}

// Utilisation de notre class
$connection = new Vmware\Soap\Client("https://<ip>/sdk/vimService.wsdl", 
    array(
        "trace" => 1, 
        "location"=>"https://<ip>/sdk/"
   )
);
// Preparation des parametres a passer a la methode
$soapMessage = array(
  "_this" => new SoapVar("ServiceInstance", XSD_STRING, "ServiceInstance")
);
// Appel de la methode "RetrieveServiceContent"
$result = $connection->RetrieveServiceContent($soapMessage);
// Affichage du resultat ... et ca marche
var_dump($result);