voku / portable-utf8

   * returns <b>FALSE</b> if the variable is not set and <b>NULL</b> if the filter fails.

   * @since 5.2.0

   */

  public static function filter_input(int $type, string $variable_name, int $filter = FILTER_DEFAULT, $options = null)

  {

    if (4 > \func_num_args()) {

      $var = \filter_input($type, $variable_name, $filter);

    } else {

      $var = \filter_input($type, $variable_name, $filter, $options);

    }

    return self::filter($var);

  }

  /**

   * "filter_input_array()"-wrapper with normalizes to UTF-8 NFC, converting from WINDOWS-1252 when needed.

   * @return mixed the filtered data, or <b>FALSE</b> if the filter fails.

   * @since 5.2.0

   */

  public static function filter_var($variable, int $filter = FILTER_DEFAULT, $options = null)

  {

    if (3 > \func_num_args()) {

      $variable = \filter_var($variable, $filter);

    } else {

      $variable = \filter_var($variable, $filter, $options);

    }

    return self::filter($variable);

  }

  /**

   * "filter_var_array()"-wrapper with normalizes to UTF-8 NFC, converting from WINDOWS-1252 when needed.