# Unique

- `Unique()`

Validates whether the input array contains only unique values.

```php
v::unique()->isValid([]); // true
v::unique()->isValid([1, 2, 3]); // true
v::unique()->isValid([1, 2, 2, 3]); // false
v::unique()->isValid([1, 2, 3, 1]); // false
```

## Templates

### `Unique::TEMPLATE_STANDARD`

| Mode       | Template                                |
| ---------- | --------------------------------------- |
| `default`  | {{subject}} must not contain duplicates |
| `inverted` | {{subject}} must contain duplicates     |

## Template placeholders

| Placeholder | Description                                                      |
| ----------- | ---------------------------------------------------------------- |
| `subject`   | The validated input or the custom validator name (if specified). |

## Categorization

- Arrays

## Changelog

| Version | Description |
| ------: | ----------- |
|   2.0.0 | Created     |

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See also:

- [ArrayType](ArrayType.md)
- [ArrayVal](ArrayVal.md)
- [Contains](Contains.md)
- [Each](Each.md)