Returns a KeyedIterable containing the values of the current KeyedIterable that meet a supplied condition applied to its keys and values


public function filterWithKey(
  (function(Tk,Tv):bool) $fn,
): KeyedIterable<Tk, Tv>;

Only keys and values that meet a certain criteria are affected by a call to filterWithKey(), while all values are affected by a call to mapWithKey().


  • (function(Tk,Tv):bool) $fn - The callback containing the condition to apply to the KeyedIterable keys and values.

Return Values