* the visit() methods must not only have different parameters
* but different names too.
*/
public function visitSingleInputValue(SingleInputValue $inputValue);
public function visitMultipleInputValue(MultipleInputValue $inputValue);
}
/**
* A ConcreteVisitor.
* Filters all the values provided casting them to integers.
*/
class IntFilter implements Visitor
{
}
/**
* Another ConcreteVisitor.
* Sorts multiple values.
*/
class AscendingSort implements Visitor
{
}
$userId = new SingleInputValue("42");
$categories = new MultipleInputValue(array('hated' => 16, 'ordinary' => 23, 'preferred' => 15));
$userId->acceptVisitor(new IntFilter());
printf("%s<br>", is_int($userId->get()) ? "OK" : "ERROR");
$categories->acceptVisitor(new AscendingSort());
$result = array_values($categories->get());
if ($result === array(15, 16, 23)) {
echo "OK";
} else {
echo "ERROR";
}
public function visitMultipleInputValue(MultipleInputValue $inputValue)
{
$values = $inputValue->get();
asort($values);
$inputValue->set($values);
}