RecursiveArrayIterator current array

Question

I am trying to get the whole current array and I don't think I have gone the right way about it as I get an Undefined index error sometimes.

    $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($comments_array), RecursiveIteratorIterator::SELF_FIRST);
    while ($iterator->valid()) {
        if ($iterator->hasChildren()) {
            $row = $iterator->getChildren();
            $depth = $iterator->getDepth();
            echo $row['User_ID'] . "<br>";
        }
        $iterator->next();
    }

I know you can do foreach ($iterator->getChildren() as $key => $value) but that doesn't help me as I want the whole array.

Hope this makes sense?!

Is there any particular need to iterate over the array recursively (in other words, what is the structure of the comments array)? — salathe
– salathe, Commented Jun 30, 2010 at 12:10
thanks, I'll post up an answer shortly (the array keys will relate to those in this question rather than in your paste, to aid others browsing here) — salathe
– salathe, Commented Jun 30, 2010 at 13:25
answer posted, sorry it took so long, work got in the way. :) — salathe
– salathe, Commented Jun 30, 2010 at 13:53

salathe · Accepted Answer · 2010-06-30 13:53:02Z

I often approach this kind of task with a filtering iterator, rather than having some crazy nested set of if blocks. Oftentimes, tasks like these can be abstracted out to something more generic--useful for more than just this one array/loop--and this is the approach I've taken here.

Because of that, the answer below is not the easiest, quickest or smallest change to your code to get the job done. However, it might come in useful elsewhere for yourself or anyone else wanting to do something similar with any kind of recursive iterator.

So, the task boils down to how can I get only the parents of an iterator (or array) without the parents of parents? One way is with a filtering iterator like below:

class FirstParentIterator extends FilterIterator {
    public function __construct(RecursiveIterator $iterator) {
        parent::__construct(
            new RecursiveIteratorIterator(
                new ParentIterator($iterator),
                RecursiveIteratorIterator::SELF_FIRST
            )
        );
    }
    public function accept() {
        // Only accept immediate parents of leaf elements
        return $this->hasChildren() && ! $this->getChildren()->hasChildren();
    }
}

Putting such a filter to some use makes your original loop much tidier:

$iterator = new FirstParentIterator(new RecursiveArrayIterator($comments_array));
foreach ($iterator as $row) {
    echo $row['User_ID'] . "<br>";
}

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