PHP Change array to one dimension

Question

Function to generate array format:

function buildTree(array $elements, $parentId = 0) {
    $branch = array();

    foreach ($elements as $element) {
        if ($element['parent_id'] == $parentId) {
            $children = buildTree($elements, $element['id']);
            if ($children) {
                $element['children'] = $children;
            }
            $branch[] = $element;
        }
    }

    return $branch;
}

$tree = buildTree($rows);

Array generated:

 Array
    (
        [0] => Array
            (
                [TASK_ID] => 2
                [PARENT_TASKID] => 0
                [TASK_LEVEL] => 0
                [children] => Array
                    (
                        [0] => Array
                            (
                                [TASK_ID] => 9
                                [PARENT_TASKID] => 2
                                [TASK_LEVEL] => 1
                            )

                        [1] => Array
                            (
                                [TASK_ID] => 10
                                [PARENT_TASKID] => 2
                                [TASK_LEVEL] => 1
                            )

                    )

            )

[1] => Array
        (
            [TASK_ID] => 1
            [PARENT_TASKID] => 0
            [TASK_LEVEL] => 0
            [children] => Array
                (
                    [0] => Array
                        (
                            [TASK_ID] => 4
                            [PARENT_TASKID] => 1
                            [TASK_LEVEL] => 1
                        )

                    [1] => Array
                        (
                            [TASK_ID] => 5
                            [PARENT_TASKID] => 1
                            [TASK_LEVEL] => 1
                            [children] => Array
                                (
                                    [0] => Array
                                        (
                                            [TASK_ID] => 6
                                            [PARENT_TASKID] => 5
                                            [TASK_LEVEL] => 2
                                        )

                                )

                        )

                )

        )
    )

How can I change the above format into below:

Array
(
    [0] => Array
        (
            [TASK_ID] => 2
            [PARENT_TASKID] => 0
        )

    [1] => Array
        (
            [TASK_ID] => 9
            [PARENT_TASKID] => 2
        )

    [2] => Array
        (
            [TASK_ID] => 10
            [PARENT_TASKID] => 2
        )

)

Tried below code:

$flat = call_user_func_array('array_merge', $array);

and

$array  = your array

$result = call_user_func_array('array_merge', $array);

echo "<pre>";
print_r($result);

But does not seem to work. Please Help.

Thanks.

How are you generating the array? You have to provide us more information to help you. And also what have you tried yourself? — Jordy, Nov 25 '14 at 12:08
http://stackoverflow.com/questions/15333085/php-find-the-array-index-key-of-multi-dimensional-array-to-update-array Try this — Vaisakh Pc, Nov 25 '14 at 12:10

score 0 · Answer 1 · answered Nov 25 '14 at 12:10

0

<?php
$arr = array();
$i = 0;
foreach ($your_array[0] as $k => $v) {
    if ($k == 'TASK_ID' OR $k == 'PARENT_TASKID') {
        $arr[$i][$k] = $v;
    }
    $i++;
}
?>

Try output:

<?php
echo '<pre>';
print_r($arr);
echo '</pre>';
?>

Hope, it works for you.

answered Nov 25 '14 at 12:10

Pupil

23,834
6
44
66

Output -> `Array ( [0] => Array ( [TASK_ID] => 2 ) [1] => Array ( [PARENT_TASKID] => 0 ) )` – Slimshadddyyy Nov 25 '14 at 12:13
Add var_dump of your array so that I can run. – Pupil Nov 25 '14 at 12:18
`var_dump` of expected or existing array ? – Slimshadddyyy Nov 25 '14 at 12:20

score 0 · Answer 2 · answered Nov 25 '14 at 12:18

I have been using this for $_FILES parsing when capturing multiple files

function multi_array($array)
{
    $new = array();
    foreach($array as $key=>$elem)
    {
        if(is_array($elem))
        {
            foreach($elem as $x=>$val)
            {
                if(!is_array($val))
                {
                    $new[$x][$key] = $val;
                }
            }
        }
    }
    return $new;
}

Usage is pretty basic

$array = multi_array($array);

I hope it helps

the output is not as expected. – Slimshadddyyy Nov 25 '14 at 12:22 — Slimshadddyyy, Nov 25 '14 at 12:22

Hardik Solanki · Answer 3 · 2014-11-25T13:47:54.283

0

Try with below code :

function makeOneDimensionArray(array $array, &$res = array())
{
    foreach($array as $arr)
    {
        $res[] = array(
            'TASK_ID' => $arr['TASK_ID'],
            'PARENT_TASKID' => $arr['PARENT_TASKID']
        );
        if(isset($arr['children']))
        {
            makeOneDimensionArray($arr['children'], $res);
        }

    }

    return $res;

}

$finalArr = makeOneDimensionArray($array);

print_r($finalArr);

I hope it help.

edited Nov 25 '14 at 13:47

answered Nov 25 '14 at 12:41

Hardik Solanki

3,153
1
17
28

The code is close to what is expected. But I doubt if there are two tasks with `PARENT_TASKID = 0` they will be sorted first and then the child. Pls see the array generated in question. – Slimshadddyyy Nov 25 '14 at 12:45
@Slimshadddyyy : Just put array_merge statement in foreach loop. See my edit. – Hardik Solanki Nov 25 '14 at 12:54
The output is same even if its inside foreach. Pls see my question and generated array. It has two records with `PARENT_TASKID = 0`. – Slimshadddyyy Nov 25 '14 at 12:58

score 0 · Accepted Answer · answered Nov 25 '14 at 12:55

You should use a recursive function to flatten the tree as you have used a recursive function to build the tree.

function flattenTree($tree)
{
    $flat = array();
    foreach ($tree as $item) {
        if (array_key_exists('children', $item)) {
            $children = $item['children'];
            unset($item['children']);
            $flat[] = $item;
            $flat = array_merge($flat, flattenTree($children));
        } else {
            $flat[] = $item;
        }
    }
    return $flat;
}

$flat = flattenTree($tree);

PHP Change array to one dimension

4 Answers4