//apply filter of survey contact type for search.
$contactType = CRM_Campaign_BAO_Survey::getSurveyContactType(CRM_Utils_Array::value('campaign_survey_id', $this->_formValues));
//apply filter of survey contact type for search.
$contactType = CRM_Campaign_BAO_Survey::getSurveyContactType(CRM_Utils_Array::value('campaign_survey_id', $this->_formValues));