public static function flash( $name, $string = '')
    {
        if( self::exists( $name ) )
        {
            $session = self::get( $name );
            self::delete( $name );
            return $session;
        }else{
            self::set( $name, $string );
        }
        return '';
    }
public static function flash( $name, $string = '')
    {
        if( self::exists( $name ) )
        {
            $session = self::get( $name );
            self::delete( $name );
            return $session;
        }else{
            self::set( $name, $string );
        }
        return '';
    }
public static function flash ( $ name , $ string = '' ) { if ( self :: exists ( $ name ) ) { $ session = self :: get ( $ name ) ; self :: delete ( $ name ) ; return $ session ; } else { self :: set ( $ name , $ string ) ; } return '' ; }
flash form, alert messages
flash form alert messages