getFirstKey

Definition
1
Arr::getFirstKey(array $array): int|string|null
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Description
Get the first key of the given array without affecting the internal array pointer.
Returns null if array is empty.
Examples
1
Arr::getFirstKey(['a' => 1, 'b' => 2, 'c' => 3]) -> 'a'
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Arr::getFirstKey([1, 2, 3]) -> 0
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5
Arr::getFirstKey([]) -> null
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