protected function setArg($key, $value) {
            if ($value !== null) {
                $this->args[$key] = $value;
            }

            return $this;
        }
protected function setArg($key, $value) {
            if ($value !== null) {
                $this->args[$key] = $value;
            }

            return $this;
        }
protected function setArg ( $ key , $ value ) { if ( $ value !== null ) { $ this -> args [ $ key ] = $ value ; } return $ this ; }
Sets an argument value

@author Art <a.molcanovas@gmail.com>

@param string $key   The argument
@param mixed  $value The value

@return self
Sets an argument value