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72 lines
2.1 KiB
Markdown
72 lines
2.1 KiB
Markdown
# KeyOptional
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- `KeyOptional(int|string $key, Validator $validator)`
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Validates the value of an array against a given validator when the key exists.
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```php
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v::keyOptional('name', v::stringType())->isValid([]); // true
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v::keyOptional('name', v::stringType())->isValid(['name' => 'The Respect Panda']); // true
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v::keyOptional('email', v::email())->isValid([]); // true
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v::keyOptional('email', v::email())->isValid(['email' => 'therespectpanda@gmail.com']); // true
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v::keyOptional('age', v::intVal())->isValid(['age' => 'Twenty-Five']); // false
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```
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The name of this validator is automatically set to the key name.
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```php
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v::keyOptional('age', v::intVal())->assert(['age' => 'Twenty-Five']);
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// message: age must be an integer number
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```
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## Note
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This validator will pass for anything that is not an array because it will always pass when it doesn't find a key. If you
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want to ensure the input is an array, use [ArrayType](ArrayType.md) with it.
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```php
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v::arrayType()->keyOptional('phone', v::phone())->assert('This is not an array');
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// message: "This is not an array" must be of type array
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```
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Below are some other validators that are tightly related to `KeyOptional`:
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- To validate if a key exists, use [KeyExists](KeyExists.md) instead.
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- To validate an array against a given validator requiring the key to exist, use [Key](Key.md) instead.
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## Templates
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## Template placeholders
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| Placeholder | Description |
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| ----------- | ---------------------------------------------------------------- |
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| `subject` | The validated input or the custom validator name (if specified). |
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## Categorization
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- Arrays
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- Structures
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## Changelog
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| Version | Description |
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| ------: | -------------------------- |
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| 3.0.0 | Created from [Key](Key.md) |
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---
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See also:
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- [ArrayType](ArrayType.md)
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- [ArrayVal](ArrayVal.md)
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- [Each](Each.md)
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- [Key](Key.md)
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- [KeyExists](KeyExists.md)
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- [Property](Property.md)
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- [PropertyExists](PropertyExists.md)
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- [PropertyOptional](PropertyOptional.md)
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[array]: https://www.php.net/array
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[ArrayAccess]: https://www.php.net/arrayaccess
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