getFirstKey

Definition

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

Arr::getFirstKey(['a' => 1, 'b' => 2, 'c' => 3]) -> 'a'
Arr::getFirstKey([1, 2, 3]) -> 0
Arr::getFirstKey([]) -> null