> For the complete documentation index, see [llms.txt](https://minwork.gitbook.io/array/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://minwork.gitbook.io/array/utility-methods/getfirstkey.md).

# getFirstKey

#### Definition

```php
Arr::getFirstKey(array $array): int|string|null
```

#### Description

Get the first key of the given array without affecting the internal array pointer.

Returns `null` if array is empty.

#### Examples

```php
Arr::getFirstKey(['a' => 1, 'b' => 2, 'c' => 3]) -> 'a'

Arr::getFirstKey([1, 2, 3]) -> 0

Arr::getFirstKey([]) -> null
```