PHP recursion - display child arrays on one level

Question

I have the following array:

$example = array(
array(
    'id' => 63,
    'parentid' => 0,
    'char_value' => 'End poverty in all its forms everywhere',
    'param_value' => 1,
    'children' => array(
        array(
            'id' => 84,
            'parentid' => 63,
            'char_value' => 'test 1',
            'param_value' => 1
        ),
        array(
            'id' => 85,
            'parentid' => 63,
            'char_value' => 'test 2',
            'param_value' => 1
        )
    )
));

And the following function for recursion:

function drawPropertyTree($array, $parent){
$result = array();
foreach ($array as $k => $v) {

    $pieces = explode(" ", $v['char_value'], 6);
    $name   = implode(" ", array_splice($pieces, 0, 3));

    $result[] = array(
        'id' => $v['id'],
        'parent' => $parent,
        'text' => $v['param_value'] . " " . $name
    );

    if (isset($v['children'])) {
        $result[] = drawPropertyTree($v['children'], $v['id']);
    }
}
return $result;}

I'd like to list all sub-arrays on the same level, with parent node. Here is the working sample and this is the current output:

Array
(
[0] => Array
    (
        [id] => 63
        [parent] => 0
        [text] => 1 End poverty in
    )

[1] => Array
    (
        [0] => Array
            (
                [id] => 84
                [parent] => 63
                [text] => 1 test 1
            )

        [1] => Array
            (
                [id] => 85
                [parent] => 63
                [text] => 1 test 2
            )

    )
)

This is desired result:

Array (
[0] => Array
    (
        [id] => 63
        [parent] => 0
        [text] => 1 End poverty in
    )
[1] => Array
        (
            [id] => 84
            [parent] => 63
            [text] => 1 test 1
        )

[2] => Array
        (
            [id] => 85
            [parent] => 63
            [text] => 1 test 2
        )

Stefan Gehrig · Accepted Answer · 2016-05-02 15:43:07Z

1

Just a slight change in your function required - given that you need support for arbitrary depth:

function drawPropertyTree($array, $parent)
{
    $result = array();
    foreach ($array as $k => $v) {

        $pieces = explode(" ", $v['char_value'], 6);
        $name   = implode(" ", array_splice($pieces, 0, 3));

        $result[] = array(
            'id'     => $v['id'],
            'parent' => $parent,
            'text'   => $v['param_value'] . " " . $name
        );

        if (isset($v['children'])) {
            // drawPropertyTree returns an array
            // which must be merged into the existing array
            $result = array_merge($result, drawPropertyTree($v['children'], $v['id']));
        }
    }
    return $result;
}

answered May 2, 2016 at 15:43

Stefan Gehrig

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1 Comment

George Sharvadze Over a year ago

Doh... spent an hour on this... Thanks!

kolodi · Accepted Answer · 2016-05-02 15:38:35Z

0

Make new empty array and push all elements in for loop, and check children to push them into new array as well. Without any recursion

answered May 2, 2016 at 15:38

kolodi

1,06211 silver badges17 bronze badges

2 Comments

George Sharvadze Over a year ago

Can you please provide any snippet for this?

kolodi Over a year ago

Oh, I'm in train now. Try yourself for now, I may do something after a hour

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