ConstVector::filterWithKey

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

public function filterWithKey(
  (function(int, Tv): bool) $fn,
): ConstVector<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().

Parameters

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

Returns

• ConstVector<Tv> - a ConstVector containing the values after a user-specified condition is applied to the keys and values of the current ConstVector.