create login session id without password

Hello,

Suitecrm version: 7.10.7

From below code i can create login session id and login to suitecrm,

But my question without password can i create login session id and login to suitecrm.

My Code:

	$client = new SoapClient("http://localhost/suite/service/v2/soap.php?wsdl");
	$data = (object) $_POST;

	$login_parameters = array(
		'user_name' => $userName,
		'password' => md5($userName),
		'version' => "0.1",
	);

	$response = $client->__soapCall("login", array('user_auth' => $login_parameters, "application_name" => ''));
	$session_id = $response->id;