iterable: Iterable Type Variance
Iterable Type Variance
<?php
interface Example {
public function method(array $array): iterable;
}
class ExampleImplementation implements Example {
public function method(iterable $iterable): array {
// Parameter broadened and return type narrowed.
}
}
?>
Classes extending/implementing may broaden methods using array or Traversable as parameter types to iterable or narrow return types from iterable to array or Traversable.