22 lines
426 B
Markdown
22 lines
426 B
Markdown
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# Optional
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- `v::optional(v $rule)`
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Validates if the given input is optional or not. By _optional_ we consider `null`
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or an empty string (`''`).
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```php
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v::optional(v::alpha())->validate(''); // true
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v::optional(v::digit())->validate(null); // true
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```
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***
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See also:
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* [NoWhitespace](NoWhitespace.md)
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* [NotBlank](NotBlank.md)
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* [NotEmpty](NotEmpty.md)
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* [NotOptional](NotOptional.md)
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* [NullType](NullType.md)
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