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KeyNested.md
# KeyNested - `v::keyNested(string $name)` - `v::keyNested(string $name, v $validator)` - `v::keyNested(string $name, v $validator, boolean $mandatory = true)` Validates an array key or an object property using `.` to represent nested data. Validating keys from arrays or `ArrayAccess` instances: ```php $array = [ 'foo' => [ 'bar' => 123, ], ]; v::keyNested('foo.bar')->validate($array); // true ``` Validating object properties: ```php $object = new stdClass(); $object->foo = new stdClass(); $object->foo->bar = 42; v::keyNested('foo.bar')->validate($object); // true ``` This rule was inspired by [Yii2 ArrayHelper][]. *** See also: * [Attribute](Attribute.md) * [Key](Key.md) [Yii2 ArrayHelper]: https://github.com/yiisoft/yii2/blob/68c30c1/framework/helpers/BaseArrayHelper.php "Yii2 ArrayHelper"
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