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key

Tags: PHP 5.x PHP 7.x PHP 8.x

key — Fetch a key from an array.

Description

key(
    array|object $array
): int|string|null
key() returns the index element of the current array position.

Parameters

array
The array.

Return Values

The key() function simply returns the key of the array element that's currently being pointed to by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, key() returns null.