Change key in array based first element array multidimensional

Question

How to change key of array into first element array ? I preferred using array_map.

Now I have a common array. If I have an array like this :

[
 0 => [
    'barang_id' => '7389'
    'spec' => 'KCH8AT-DM'
    'heat_no' => '7B4784'
    'coil_no' => '0210'
    'size' => '17.9'
    'weight' => '2014'
    'container' => 'TCLU6265556'
]
 1 => [
    'barang_id' => '7390'
    'spec' => 'KCH8AT-DM'
    'heat_no' => '7B4784'
    'coil_no' => '0050'
    'size' => '17.9'
    'weight' => '2006'
    'container' => 'TCLU6265556'
 ]
]

I need like this. The value of first element array is going to be key of array.

[
 7389 => [
    'barang_id' => '7389'
    'spec' => 'KCH8AT-DM'
    'heat_no' => '7B4784'
    'coil_no' => '0210'
    'size' => '17.9'
    'weight' => '2014'
    'container' => 'TCLU6265556'
]
 7390 => [
    'barang_id' => '7390'
    'spec' => 'KCH8AT-DM'
    'heat_no' => '7B4784'
    'coil_no' => '0050'
    'size' => '17.9'
    'weight' => '2006'
    'container' => 'TCLU6265556'
 ]
]

Please advise

HSLM · Accepted Answer · 2017-10-17 05:45:16Z

2

I thought with this solution using array_map

$a = [['id' => 1233, 'name' => 'test1'], ['id' => 1313, 'name' => 'test2'], ['id' => 13123, 'name' => 'test3']];

$result = [];
array_map(
    function ($item, $key) use (&$result) {
        $result[$item['id']] = $item;
        return $item; // you can ignore this
    }, $a, array_keys($a)
);

now result contains what you want, check this image:

Or you could use it like this (without the $result thing) but you should unset the old key, look at the image:

edited Oct 17, 2017 at 5:45

answered Oct 17, 2017 at 5:16

HSLM

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Comments

madalinivascu · Accepted Answer · 2017-10-17 05:02:23Z

1

if you have only 2 values you can create a new array:

$newarray[7389] = $oldarray[0];
$newarray[7390] = $oldarray[1];

or if you have multiple values you can do:

$newarray =[];
foreach($oldarray as $value) {
$newarray[$value['barang_id']] = $value

}

demo:https://ideone.com/mm2T7T

edited Oct 17, 2017 at 5:02

answered Oct 17, 2017 at 4:55

madalinivascu

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Comments

Gordon · Accepted Answer · 2017-10-17 05:08:52Z

1

You cannot use array_map, because array_map will not pass the keys to the callback. But array_walk would work:

$reindexed = [];
array_walk($data, function($v, $k) use (&$reindexed) {
    $reindexed[$v['barang_id']] = $v;
});

This has no advantage over a plain old foreach though.

edited Oct 17, 2017 at 5:08

answered Oct 17, 2017 at 5:07

Gordon

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2 Comments

marekful Over a year ago

Would this be simpler with plain foreach?

Gordon Over a year ago

@marekful yes, in my opinion a foreach would be simpler. it's more readable to me and it doesn't need a reference nor callback.

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