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How do I use `NestedArray::getValue()` to get a value from an array?

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GuyPaddock

I see the NestedArray::getValue() but the documentation isn't clear. How do I use this to get a value out of a nested array, such as form state or raw form input?

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GuyPaddock

If you have an array like this:

$my_array = [
  'key1' => [
    'key1.1' => 'a',
    'key1.2' => 'b',
    'key1.3' => 'c',
  ],
  'key2' => [
    'key2.1' => 'x',
    'key2.2' => 'y',
    'key2.3' => 'z',
  ],
];

And you want to get to $my_array['key2']['key2.2'] dynamically (e.g., using an array of #parents from a form element), you can use NestedArray::getValue($my_array, ['key2', 'key2.2']).

As a bonus, this method returns a reference to the value so you can also change what you get back and the change will be reflected in the array.

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