mirror of
https://github.com/Respect/Validation.git
synced 2026-03-15 06:45:44 +01:00
16148e9593
- Remove redundant "valid" prefix: Date, DateTime, DateTimeDiff, Domain, Email, Iban, Imei, Ip, Isbn, Json, LanguageCode, LeapDate, LeapYear, Luhn, MacAddress, NfeAccessKey, Nif, Nip, Pesel, Phone, Pis, PolishIdCard, PostalCode, Roman, Slug, Tld, Url, Uuid, Version. - Remove redundant "value" suffix ArrayVal, BoolVal, Countable, FloatVal, IntVal, IterableVal, NumericVal, ScalarVal, StringVal. - Standardize "consist only of" phrasing Alnum, Alpha, Cntrl, Consonant, Digit, Graph, Lowercase, Printable, Punct, Space, Spaced, Uppercase, Vowel, Xdigit. - Improve file accessibility messages Directory, Executable, File, Image, Readable, SymbolicLink, Writable. - Improve grammar and article usage CreditCard, Extension, Mimetype, Regex, Size.
84 lines
2.4 KiB
Markdown
84 lines
2.4 KiB
Markdown
<!--
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SPDX-License-Identifier: MIT
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SPDX-FileCopyrightText: (c) Respect Project Contributors
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SPDX-FileContributor: Alexandre Gomes Gaigalas <alganet@gmail.com>
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SPDX-FileContributor: Henrique Moody <henriquemoody@gmail.com>
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-->
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# KeyOptional
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- `KeyOptional(string|int $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())->assert([]);
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// Validation passes successfully
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v::keyOptional('name', v::stringType())->assert(['name' => 'The Respect Panda']);
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// Validation passes successfully
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v::keyOptional('email', v::email())->assert([]);
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// Validation passes successfully
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v::keyOptional('email', v::email())->assert(['email' => 'therespectpanda@gmail.com']);
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// Validation passes successfully
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v::keyOptional('age', v::intVal())->assert(['age' => 'Twenty-Five']);
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// → `.age` must be an integer
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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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// → `.age` must be an integer
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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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// → "This is not an array" must be an 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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## 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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