ArrayIterator的valid（）始终显示为true

Question

I have a problem with ArrayIterator::valid() method. It always return true. I don't know if I don't understand how should it work, or am I doing something wrong...

I use Doctrine's Paginator
http://www.doctrine-project.org/api/orm/2.1/source-class-Doctrine.ORM.Tools.Pagination.Paginator.html

It does implement \Countable and \IteratorAggregate. The method getIterator() returns \ArrayIterator.

In view I do:

<?php foreach ($this->paginator as $message): ?>
    <?php var_dump($this->paginator->valid()); ?> // Fatal error. Method does not exist
    <?php var_dump($this->paginator->getIterator()->valid()); ?> // <-- it always return true
    <p>Teeeeeest</p>
<?php endforeach; ?>

I also tried:

<?php $paginator = $this->paginator->getIterator(); ?>
<?php foreach ($paginator as $message): ?>
    <?php var_dump($paginator->valid()); ?> // <-- it always return true
    <p>Teeeeeest</p>
<?php endforeach; ?>

var_dump($this->paginator) shows that I have 2 records. So I should get true in first iteration and false in second iteration. Am I correct? So why does it return always true

Answer 1

The foreach takes only valid entries, so $paginator->valid() is always valid at this point. If you use $paginator->next() that will end in false after the last entry was proccessed.

So $paginator->valid() is used with $paginator->next() not within a foreach

Try to test it like that.

$paginator->reset();
while($paginator->valid()){
    $entrie = $paginator->current();

    $paginator->next();
}

or test it with var_dump($paginator->valid()); after the foreach. (But maybe the foreach will reset the iterator after iteration)

:-)