display name added

			return $response;

		}

		$validationError = $this->validateInput('displayname', $displayname, 30);

		if ($validationError !== null) {

			$response->setData(['message' => $validationError, 'success' => false]);

			return $response;

		}

		$inputData = [

			'username' => ['value' => $username, 'maxLength' => 30],

			'displayname' => ['value' => $displayname, 'maxLength' => 30]

		];

		$validationError = $this->validateInput('username', $username, 30);

		foreach ($inputData as $inputName => $inputInfo) {

			$validationError = $this->validateInput($inputName, $inputInfo['value'], $inputInfo['maxLength']);

			if ($validationError !== null) {

				$response->setData(['message' => $validationError, 'success' => false]);

				$response->setStatus(400);

				return $response;

			}

		}

		try {

			$username = mb_strtolower($username, 'UTF-8');