PHP RecursiveIteratorIterator not outputting all keys

Question

I have the following multidimensional array:

$array = array(
  1 => null,
  2 => array(
    3 => null,
    4 => array(
      5 => null,
    ),
    6 => array(
      7 => null,
    ),
  )
);

If I use the following code to iterate over the array

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
foreach ($iterator as $key => $value) {
  echo $key.' ';
}

it only outputs the keys with no arrays assigned to them. I.e.

1 3 5 7

How can I get it to include all of the keys?

Rizier123 · Accepted Answer · 2016-03-02 18:53:28Z

6

You just need to set the mode right. From the manual:

RecursiveIteratorIterator::SELF_FIRST - Lists leaves and parents in iteration with parents coming first.

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)
                                          , RecursiveIteratorIterator::SELF_FIRST);

answered Mar 2, 2016 at 18:53

Rizier123

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2 Comments

Matteo Tassinari Over a year ago

seems to work: sandbox.onlinephpfunctions.com/code/…

salathe Over a year ago

SELF_FIRST and CHILD_FIRST modes will both give the non-leaf items (in your case, the arrays), whereas the default LEAVES_ONLY mode does not.

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