Remove duplicate value from multidimensional array on every level [duplicate]

Question

I have the following array :

And here is my expected result :

Array
(
    [0] => Array
        (
            [id] => 1
            [text] => Vehicule
            [state] => Array
                (
                    [opened] => 1
                )

            [children] => Array
                (
                    [0] => Array
                        (
                            [id] => 2
                            [text] => Cars
                            [parent] => 1
                            [children] => Array
                            (
                                [0] => Array
                                (
                                [id] => 99
                                [text] => BMW
                                [parent] => 2
                            )

                        )

                    [1] => Array
                        (
                            [id] => 3
                            [text] => Bikes
                            [parent] => 1
                        )

                    [2] => Array
                        (
                            [id] => 12
                            [text] => Boat
                            [parent] => 1
                        )

                )

        )

)

I have tried using

$arr= array_map("unserialize", array_unique(array_map("serialize", $arr)));

But it remove only the first array duplicated, it doesn't drill down.

PHP snippet : https://onlinephp.io/c/f6521

Specific answer: stackoverflow.com/a/3598326/5882307

Omi Shah
– Omi Shah

2022-11-03 16:12:03 +00:00
Commented Nov 3, 2022 at 16:12 — Omi Shah
– Omi Shah, Commented Nov 3, 2022 at 16:12

Omi Shah · Accepted Answer · 2022-11-03 16:19:43Z

0

This will result in your expected output

function reduceArray($array){
    foreach($array as $c=>$v){
        if(is_array($v)){
            $array[$c] = reduceArray($v);
        }
    }
    return array_map("unserialize", array_unique(array_map("serialize", $array)));
}
         
print_r(reduceArray($arr));

But if in a sub array are the same values, like:

$arr = [
  'foo'=>1,
  'bar'=>1
];

Then this code will not work anymore.

There is no save and easy solution to your problem. This is just a dirty solution.

edited Nov 3, 2022 at 16:19

Omi Shah

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answered Nov 3, 2022 at 16:09

Foobar

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2 Comments

Omi Shah Over a year ago

Duplicate/copied stackoverflow.com/a/3598326/5882307 ?

Foobar Over a year ago

@OMiShah No i dont copy stuff. And doing unserialize after going into a the sub arrays is bottom-up and not a top-down approach. Thanks for the vote.

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