protected function _getRule($rule)
    {
        if ($rule instanceof Zend_Filter_Interface) {
            return $rule;
        }

        $rule = (string) $rule;

        $className  = $this->getPluginLoader()->load($rule);
        $ruleObject = new $className();
        if (!$ruleObject instanceof Zend_Filter_Interface) {

            throw new Zend_Filter_Exception('No class named ' . $rule . ' implementing Zend_Filter_Interface could be found');
        }

        return $ruleObject;
    }
protected function _getRule($rule)
    {
        if ($rule instanceof Zend_Filter_Interface) {
            return $rule;
        }

        $rule = (string) $rule;

        $className  = $this->getPluginLoader()->load($rule);
        $ruleObject = new $className();
        if (!$ruleObject instanceof Zend_Filter_Interface) {

            throw new Zend_Filter_Exception('No class named ' . $rule . ' implementing Zend_Filter_Interface could be found');
        }

        return $ruleObject;
    }
protected function _getRule ( $ rule ) { if ( $ rule instanceof Zend_Filter_Interface ) { return $ rule ; } $ rule = ( string ) $ rule ; $ className = $ this -> getPluginLoader ( ) -> load ( $ rule ) ; $ ruleObject = new $ className ( ) ; if ( ! $ ruleObject instanceof Zend_Filter_Interface ) { throw new Zend_Filter_Exception ( 'No class named ' . $ rule . ' implementing Zend_Filter_Interface could be found' ) ; } return $ ruleObject ; }
Resolve named filters and convert them to filter objects.

@param  string $rule
@return Zend_Filter_Interface
Resolve named filters and convert them to filter objects .