# In

- `In(mixed $haystack)`
- `In(mixed $haystack, bool $identical)`

Validates if the input is contained in a specific haystack.

For strings:

```php
v::in('lorem ipsum')->isValid('ipsum'); // true
```

For arrays:

```php
v::in(['lorem', 'ipsum'])->isValid('lorem'); // true
```

A second parameter may be passed for identical comparison instead
of equal comparison.

Message template for this validator includes `{{haystack}}`.

## Templates

### `In::TEMPLATE_STANDARD`

| Mode       | Template                             |
|------------|--------------------------------------|
| `default`  | {{name}} must be in {{haystack}}     |
| `inverted` | {{name}} must not be in {{haystack}} |

## Template placeholders

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

## Categorization

- Arrays
- Comparisons
- Strings

## Changelog

| Version | Description |
|--------:|-------------|
|   0.3.9 | Created     |

***
See also:

- [Contains](Contains.md)
- [ContainsAny](ContainsAny.md)
- [EndsWith](EndsWith.md)
- [Roman](Roman.md)
- [StartsWith](StartsWith.md)