Scalr::GenerateRandomKey PHP Method

    public static function GenerateRandomKey($length = 128)
    {
        //Is there windows os?
        if (DIRECTORY_SEPARATOR === '\\') {
            //windows os
            $rnd = '';
            $t = ceil($length / 40);
            for ($i = 0; $i < $t; ++$i) {
                $rnd .= sha1(uniqid());
            }
        } else {
            //unix os
            $rnd = file_get_contents('/dev/urandom', null, null, 0, $length);
        }
        $key = substr(base64_encode($rnd), 0, $length);
        return $key;
    }

 public function xSaveAction($url, $endpointId = null)
 {
     if (!$endpointId) {
         $endpoint = new WebhookEndpoint();
         $endpoint->level = WebhookEndpoint::LEVEL_ENVIRONMENT;
         $endpoint->accountId = $this->getEnvironment()->clientId;
         $endpoint->envId = $this->getEnvironmentId();
         $endpoint->securityKey = Scalr::GenerateRandomKey(64);
     } else {
         $endpoint = WebhookEndpoint::findPk($endpointId);
         if ($endpoint->envId != $this->getEnvironmentId() || $endpoint->accountId != $this->getEnvironment()->clientId) {
             throw new Scalr_Exception_Core('Insufficient permissions to edit endpoint');
         }
     }
     foreach (WebhookEndpoint::findByUrl($url) as $ep) {
         if ($ep->endpointId != $endpoint->endpointId && $ep->envId == $this->getEnvironmentId()) {
             $this->request->addValidationErrors('url', 'Endpoint url must be unique within environment');
             break;
         }
     }
     if ($this->request->isValid()) {
         if ($endpoint->url != $url) {
             $endpoint->isValid = false;
             $endpoint->url = $url;
         }
         ////temporarily disable url validation per Igor`s request(see also webhooks/endpoints/view.js)
         $endpoint->isValid = true;
         $endpoint->save();
         $this->response->data(array('endpoint' => array('endpointId' => $endpoint->endpointId, 'url' => $endpoint->url, 'isValid' => $endpoint->isValid, 'validationToken' => $endpoint->validationToken, 'securityKey' => $endpoint->securityKey)));
     } else {
         $this->response->data($this->request->getValidationErrors());
         $this->response->failure();
     }
 }