public function setTtl($ttl)
    {
        /**
         * @see Zend_Validate_Int
         */
        require_once 'Zend/Validate/Int.php';
        $validate = new Zend_Validate_Int();
        if (!$validate->isValid($ttl)) {
            /**
             * @see Zend_Feed_Builder_Exception
             */
            require_once 'Zend/Feed/Builder/Exception.php';
            throw new Zend_Feed_Builder_Exception("you have to set an integer value to the ttl property");
        }
        $this->offsetSet('ttl', $ttl);
        return $this;
    }
public function setTtl($ttl)
    {
        /**
         * @see Zend_Validate_Int
         */
        require_once 'Zend/Validate/Int.php';
        $validate = new Zend_Validate_Int();
        if (!$validate->isValid($ttl)) {
            /**
             * @see Zend_Feed_Builder_Exception
             */
            require_once 'Zend/Feed/Builder/Exception.php';
            throw new Zend_Feed_Builder_Exception("you have to set an integer value to the ttl property");
        }
        $this->offsetSet('ttl', $ttl);
        return $this;
    }
public function setTtl ( $ ttl ) { /**
         * @see Zend_Validate_Int
         */ require_once 'Zend/Validate/Int.php' ; $ validate = new Zend_Validate_Int ( ) ; if ( ! $ validate -> isValid ( $ ttl ) ) { /**
             * @see Zend_Feed_Builder_Exception
             */ require_once 'Zend/Feed/Builder/Exception.php' ; throw new Zend_Feed_Builder_Exception ( "you have to set an integer value to the ttl property" ) ; } $ this -> offsetSet ( 'ttl' , $ ttl ) ; return $ this ; }
How long in minutes a feed can be cached before refreshing
Ignored if atom is used

@param  int $ttl
@return Zend_Feed_Builder_Header
@throws Zend_Feed_Builder_Exception
How long in minutes a feed can be cached before refreshing Ignored if atom is used