filter_var_array($date, $instructions):
array(5) {
  ["age"]=>
  int(21)
  ["rating"]=>
  int(4)
  ["price"]=>
  string(4) "9.95"
  ["thousands"]=>
  string(10) "100,000.95"
  ["european"]=>
  string(10) "100.000,95"
}

$data:
Array
(
    [age] => 21
    [rating] => 4
    [price] => 9.95
    [thousands] => 100,000.95
    [european] => 100.000,95
)
1

$instructions:
Array
(
    [age] => 257
    [rating] => Array
        (
            [filter] => 257
            [options] => Array
                (
                    [filter] => 257
                    [options] => Array
                        (
                            [min_range] => 1
                            [max_range] => 5
                        )

                )

        )

    [price] => Array
        (
            [filter] => 520
            [flags] => 4096
        )

    [thousands] => Array
        (
            [filter] => 520
            [flags] => 12288
        )

    [european] => Array
        (
            [filter] => VILTER_VALIDATE_FLOAT
            [options] => Array
                (
                    [decimal] => ,
                )

            [flags] => FILTER_FLAG_ALLOW_THOUSANDS
        )

)
1