PHP complex multidimensional array iteration

Question

I need to iterate through multidimensional array. But I need to do it complex: iteration must go by levels - at first elements of 1 level, only after them elements of 2 level, after them elements of 3 level, etc.

I can write it myself if I want to, but I need to make sure I'm not reinventing the wheel. Is there any ready implementation of this in PHP?

UPDATE

What code should i provide? It's a theoretical issue. I can provide you an array.. :

Array
(
    [lev1_1] => Array
        (
            [ID] => 3547
            [children] => Array
                (
                    [lev2_1] => Array
                        (
                            [ID] => 3550
                        )

                    [lev2_2] => Array
                        (
                            [ID] => 3551
                        )
                )
        )
    [lev1_2] => Array
        (
            [ID] => 3547
            [children] => Array
                (
                    [lev2_3] => Array
                        (
                            [ID] => 3550
                            [children] => Array
                                (
                                    [lev3_1] => Array
                                        (
                                            [ID] => 3550
                                        )

                                    [lev3_2] => Array
                                        (
                                            [ID] => 3551
                                        )
                                )
                        )

                    [lev2_4] => Array
                        (
                            [ID] => 3551
                        )
                )
        )

I need iterate through lev1_x, then lev2_x, then lev3_x

You need to provide the code you have tried so far to iterate through the array! we're not going to do your work for you! Unless you plan to pay that is. — Joshua Kissoon
– Joshua Kissoon, Commented Mar 24, 2014 at 15:12

svvac · Accepted Answer · 2014-03-24 16:10:24Z

Well, here's a dumb way to get the values by level. Please note that you'll need to tweak the code according to your use.

function array_values_by_level($array, $level = 0, &$values = null) {
    if ($values === null)
        $values = array();
    if (!isset($values[$level]))
        $values[$level] = array();
    foreach ($array as $v) {
        if (is_array($v))
            array_values_by_level($v, $level + 1, &$values);
        else
            $values[$level][] = $v;
    }

    return $values;
}

Test case:

$big_array = array(
    '1',
    '2',
    array(
        '2.1',
        '2.2',
        array(
            '2.2.1',
            '2.2.2',
            array(
                '2.2.2.1'
            )
        ),
        '2.3',
        array(
            '2.3.1',
            array(
                '2.3.1.1',
                '2.3.1.2'
            )
        )
    )
);

foreach (array_values_by_level($big_array) as $k => $v)
    printf("[%d] %s \n", $k, implode(', ', $v));

// [0] 1, 2
// [1] 2.1, 2.2, 2.3
// [2] 2.2.1, 2.2.2, 2.3.1
// [3] 2.2.2.1, 2.3.1.1, 2.3.1.2

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