// Create ad group criterion.
    $adGroupCriterion = new BiddableAdGroupCriterion();
    $adGroupCriterion->adGroupId = $adGroupId;
    $adGroupCriterion->criterion = $keyword;
    $adGroupCriterion->experimentData = $adGroupCriterionExperimentData;
    // Create operation.
    $adGroupCriterionOperation = new AdGroupCriterionOperation();
    $adGroupCriterionOperation->operand = $adGroupCriterion;
    $adGroupCriterionOperation->operator = 'ADD';
    $adGroupCriterionOperations = array($adGroupCriterionOperation);
    // Make the mutate request.
    $result = $adGroupCriterionService->mutate($adGroupCriterionOperations);
    // Display result.
    $adGroupCriterion = $result->value[0];
    printf("Keyword with text '%s', match type '%s', and id '%s' was added to " . "the experiment.\n", $adGroupCriterion->criterion->text, $adGroupCriterion->criterion->matchType, $adGroupCriterion->criterion->id);
}
// Don't run the example if the file is being included.
if (__FILE__ != realpath($_SERVER['PHP_SELF'])) {
    return;
}
try {
    // Get AdWordsUser from credentials in "../auth.ini"
    // relative to the AdWordsUser.php file's directory.
    $user = new AdWordsUser();
    // Log every SOAP XML request and response.
    $user->LogAll();
    // Run the example.
    AddExperimentExample($user, $campaignId, $adGroupId);
} catch (Exception $e) {
    printf("An error has occurred: %s\n", $e->getMessage());
}
 public function testAddExperimentExample()
 {
     AddExperimentExample($this->user, $this->campaignId, $this->adGroupId);
 }