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

public function filterWithKey(
  (function(int, mixed): bool) $callback,
): ImmVector<mixed>;

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(int, mixed): bool) $callback - The callback containing the condition to apply to the current Pair keys and values.