HH\Pair::filterWithKey

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().

Parameters

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

Returns

• ImmVector<mixed> - an ImmVector containing the values after a user-specified condition is applied to the keys and values of the current Pair.