Capture return from a WebService

I managed via PHP to connect to a WebService via SOAP, but I can not capture the return data. I made a var_dump in the return variable, and what is displayed on the screen follows below:

object(stdClass)[2]
  public 'BuscaSMPResult' => 
    object(stdClass)[3]
      public 'MensagensErro' => 
        object(stdClass)[4]
          public 'RetornoMensagem' => 
            object(stdClass)[5]
              ...
      public 'TransacaoOk' => boolean false
      public 'SMP' => null

How can I capture this data?

Edit

Text returned when using print_r instead of var_dump :

stdClass Object
(
    [InsereSMPResult] => stdClass Object
        (
            [MensagensErro] => stdClass Object
                (
                    [RetornoMensagem] => stdClass Object
                        (
                            [Codigo] => 1001
                            [Mensagem] => É necessário informar o Token
                        )

                )

            [TransacaoOk] => 
            [MensagensAviso] => stdClass Object
                (
                )

            [MensagensSucesso] => stdClass Object
                (
                )

            [AnoSMP] => 0
            [IdSMP] => 0
            [NumeroSMP] => 0
        )

)