Returns a ImmVector containing the values of the current Pair that meet a supplied condition

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

Only values that meet a certain criteria are affected by a call to filter(), while all values are affected by a call to map().


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

Return Values