respect-validation/docs/validators/Countable.md
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# Countable
- `Countable()`
Validates if the input is countable, in other words, if you're allowed to use
[count()](http://php.net/count) function on it.
```php
v::countable()->assert([]);
// Validation passes successfully
v::countable()->assert(new ArrayObject());
// Validation passes successfully
v::countable()->assert('string');
// → "string" must be a countable value
```
## Templates
### `Countable::TEMPLATE_STANDARD`
| Mode | Template |
| ---------: | :---------------------------------------- |
| `default` | {{subject}} must be a countable value |
| `inverted` | {{subject}} must not be a countable value |
## Template placeholders
| Placeholder | Description |
| ----------- | ---------------------------------------------------------------- |
| `subject` | The validated input or the custom validator name (if specified). |
## Categorization
- Types
## Changelog
| Version | Description |
| ------: | :---------------------- |
| 1.0.0 | Created from `ArrayVal` |
## See Also
- [ArrayType](ArrayType.md)
- [ArrayVal](ArrayVal.md)
- [Instance](Instance.md)
- [IterableType](IterableType.md)
- [IterableVal](IterableVal.md)