40 lines
732 B
Markdown
40 lines
732 B
Markdown
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# Key
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- `v::key(string $name)`
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- `v::key(string $name, v $validator)`
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- `v::key(string $name, v $validator, boolean $mandatory = true)`
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Validates an array key.
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```php
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$dict = [
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'foo' => 'bar'
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];
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v::key('foo')->validate($dict); // true
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```
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You can also validate the key value itself:
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```php
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v::key('foo', v::equals('bar'))->validate($dict); // true
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```
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Third parameter makes the key presence optional:
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```php
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v::key('lorem', v::stringType(), false)->validate($dict); // true
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```
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The name of this validator is automatically set to the key name.
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***
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See also:
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* [ArrayVal](ArrayVal.md)
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* [Attribute](Attribute.md)
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* [Each](Each.md)
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* [KeyNested](KeyNested.md)
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* [KeySet](KeySet.md)
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* [KeyValue](KeyValue.md)
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