# Installation

HTML: [altophp.com/scale/installation](https://altophp.com/scale/installation/)

ALTO Scale requires PHP 8.4 or later and has no runtime dependencies.

```bash
composer require alto/scale
```

## Verify the installation

```php
<?php

require __DIR__.'/vendor/autoload.php';

use Alto\Scale\Scale;

$scale = Scale::linear(base: 0, increment: 8);

echo $scale->get(3);
```

The script prints `24`.

Invalid bases, ratios, increments, ranges, or datasets raise
`Alto\Scale\Exception\ScaleException`.

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ALTO\SCALE: [altophp.com/scale](https://altophp.com/scale/)
ALTO(PHP): [altophp.com](https://altophp.com/)