class_parents
Yes, but ...
Traversable: "Abstract base interface that cannot be implemented alone. Instead it must be implemented by either IteratorAggregate or Iterator."
So You have to implement IteratorAggregate or Iterator because You can not implement Traversable.
iterator_count
(PHP 5 >= 5.1.3)
iterator_count — Count the elements in an iterator
Описание
int iterator_count
( IteratorAggregate $iterator
)
Внимание
К настоящему времени эта функция еще не была документирована; для ознакомления доступен только список аргументов.
Count the elements in an iterator.
Список параметров
- iterator
-
The iterator being counted.
Возвращаемые значения
The number of elements in iterator .
add a note
User Contributed Notesiterator_count
Micha Mech
09-May-2008 12:38
09-May-2008 12:38
Ard
31-Aug-2006 12:39
31-Aug-2006 12:39
Note that you that the iterator parameter doesn't need to be of type Aggregate. As the spl documentation on http://www.php.net/~helly/php/ext/spl/ defines it in the following way:
iterator_count (Traversable $it).
So you can count the number of files in a given directory quite easily:
<?php iterator_count(new DirectoryIterator('path/to/dir/')); ?>