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array_key_first › WordPress Function

Since5.9.0
Deprecatedn/a
array_key_first ( $arr )
Parameters:
  • (array) $arr An array.
    Required: Yes
Returns:
  • (string|int|null) The first key of array if the array is not empty; `null` otherwise.
Defined at:
Codex:

Polyfill for array_key_first() function added in PHP 7.3.

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


Source

function array_key_first( array $arr ) {
		foreach ( $arr as $key => $value ) {
			return $key;
		}
	}
}