Smarty::addPluginsDir PHP Method

    public function addPluginsDir($plugins_dir)
    {
        // make sure we're dealing with an array
        $this->plugins_dir = (array) $this->plugins_dir;
        if (is_array($plugins_dir)) {
            foreach ($plugins_dir as $k => $v) {
                if (is_int($k)) {
                    // indexes are not merged but appended
                    $this->plugins_dir[] = rtrim($v, '/\\') . DS;
                } else {
                    // string indexes are overridden
                    $this->plugins_dir[$k] = rtrim($v, '/\\') . DS;
                }
            }
        } else {
            // append new directory
            $this->plugins_dir[] = rtrim($plugins_dir, '/\\') . DS;
        }
        $this->plugins_dir = array_unique($this->plugins_dir);
        return $this;
    }

 /**
  * @param waSystem $system
  * @param array $options
  * @return waSmarty3View
  */
 public function __construct(waSystem $system, $options = array())
 {
     $this->smarty = new Smarty();
     parent::__construct($system, $options);
     if (isset($options['auto_literal'])) {
         $this->smarty->auto_literal = $options['auto_literal'];
     }
     if (isset($options['left_delimiter'])) {
         $this->smarty->left_delimiter = $options['left_delimiter'];
     }
     if (isset($options['right_delimiter'])) {
         $this->smarty->right_delimiter = $options['right_delimiter'];
     }
     $this->smarty->setTemplateDir(isset($options['template_dir']) ? $options['template_dir'] : $system->getAppPath());
     $this->smarty->setCompileDir(isset($options['compile_dir']) ? $options['compile_dir'] : $system->getAppCachePath('templates/compiled/'));
     $this->smarty->setCacheDir($system->getAppCachePath('templates/cache/'));
     if (ini_get('safe_mode')) {
         $this->smarty->use_sub_dirs = false;
     } else {
         $this->smarty->use_sub_dirs = true;
     }
     // not use
     //$this->smarty->setCompileCheck(wa()->getConfig()->isDebug()?true:false);
     $this->smarty->addPluginsDir($system->getConfig()->getPath('system') . '/vendors/smarty-plugins');
     $this->smarty->loadFilter('pre', 'translate');
 }