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array_key_first › WordPress Function

Since5.9.0
Deprecatedn/a
› array_key_first ( $array )
Parameters:
  • (array) $array 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.


Related Functions: array_key_last, array_is_list, _wp_array_get, _wp_array_set, registered_meta_key_exists

Source 

function array_key_first( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
		if ( empty( $array ) ) {
			return null;
		}

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