# Range constraint

## Literal bounds

### Example

The validation type is `integer` and the criteria is `between`, with minimum `1` and maximum `10`. The value of `A1` therefore must be an integer in the closed range `1..10`.

```php
$config = [
    'path' => './'
];

$validation = new \Vtiful\Kernel\Validation();
$validation->validationType(\Vtiful\Kernel\Validation::TYPE_INTEGER)
    ->criteriaType(\Vtiful\Kernel\Validation::CRITERIA_BETWEEN)
    ->minimumNumber(1)
    ->maximumNumber(10);

$excel    = new \Vtiful\Kernel\Excel($config);
$filePath = $excel->fileName('tutorial.xlsx')
    ->header(['Value'])
    ->validation('A1', $validation->toResource())
    ->insertText(0, 0, 20) // Out-of-range; the write succeeds, Excel flags the cell on open.
    ->output();
```

## Bounds taken from cells

### Example

The validation type is `integer` and the criteria is `between`, with the lower bound read from cell `A1` and the upper bound from `B1`. The value of `C1` must therefore be an integer between the values of `A1` and `B1`.

```php
$config = [
    'path' => './'
];

$validation = new \Vtiful\Kernel\Validation();
$validation->validationType(\Vtiful\Kernel\Validation::TYPE_INTEGER)
    ->criteriaType(\Vtiful\Kernel\Validation::CRITERIA_BETWEEN)
    ->minimumFormula('=A1')
    ->maximumFormula('=B1');

$excel    = new \Vtiful\Kernel\Excel($config);
$filePath = $excel->fileName('tutorial.xlsx')
    ->header([1, 10])
    ->validation('C1', $validation->toResource())
    ->insertText(0, 2, 20)
    ->output();
```


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