Sample Call

<?php
// SOAP_CLIENT_BASEDIR - folder that contains the PHP Toolkit and your WSDL
// $USERNAME - variable that contains your Salesforce.com username (must be in the form of an email)
// $PASSWORD - variable that contains your Salesforce.com password

define("SOAP_CLIENT_BASEDIR", "../../soapclient");
require_once (SOAP_CLIENT_BASEDIR.'/SforceEnterpriseClient.php');

require_once ('../userAuth.php');
try {
  $mySforceConnection = new SforceEnterpriseClient();
  $mySoapClient = $mySforceConnection->createConnection(SOAP_CLIENT_BASEDIR.'/enterprise.wsdl.xml');
  $mylogin = $mySforceConnection->login($USERNAME, $PASSWORD);

  echo "***** Get Server Timestamp *****\n";
  $response = $mySforceConnection->getServerTimestamp();
  print_r($response);
} catch (Exception $e) {
	print_r($e);
}
?>

Sample Output

***** Get Server Timestamp *****
stdClass Object
(
    [timestamp] => 2008-09-17T00:26:02.818Z
)