private function setParam($key, $value, $allowed_keys)
    {
        if (in_array($key, $allowed_keys)) {
            $this->{$key} = $value;
        }
    }
private function setParam($key, $value, $allowed_keys)
    {
        if (in_array($key, $allowed_keys)) {
            $this->{$key} = $value;
        }
    }
private function setParam ( $ key , $ value , $ allowed_keys ) { if ( in_array ( $ key , $ allowed_keys ) ) { $ this -> { $ key } = $ value ; } }
Set valid Access Point.

@param  string  $key
@param  mixed  $value
@param  array  $allowed_keys
@return void
Set valid Access Point .