Returns a subset of the current ConstMap starting from a given key location up to, but not including, the element at the provided length from the starting key location

public function slice(
  int $start,
  int $len,
): ConstMap<Tk, Tv>;

$start is 0-based. $len is 1-based. So slice(0, 2) would return the keys and values at key location 0 and 1.

The returned ConstMap will always be a proper subset of the current ConstMap.


  • int $start - The starting key location of the current ConstMap for the returned ConstMap.
  • int $len - The length of the returned ConstMap.