Unique values of the array with four fields

Question

I've an array like this:

array(
    0 => array(1, 2, 3, 4),
    1 => array(1, 3, 2, 4),
    2 => array(1, 2, 4, 3),
    3 => array(1, 2, 5, 6)
)

I have to remove records that are repeated. So I need finally to have this array:

array(
    0 => array(1, 2, 3, 4),
    3 => array(1, 2, 5, 6)
)

The script is in PHP.

Who can help? :)

Have you tried with any code on your own? Show some effort at least. — Sougata Bose, May 29 '15 at 10:46
Yeah, I'm trying, but I'm doing additional loop to filtering. I wanna do it without loop. — JakubKubera, May 29 '15 at 10:50
@JakubKubera ^ Then show your work which you have done and your effort! Edit your question and add your code — Rizier123, May 29 '15 at 10:50
@Uchiha OP will get a notification for *every* answer, which he gets, so no need for writing a comment, which goes under too chatty. — Rizier123, May 29 '15 at 11:09
@Rizier123 I've deleted my comment. Thanks for pointing out. — Narendrasingh Sisodia, May 29 '15 at 11:11

Rizier123 · Accepted Answer · 2015-05-29T11:09:03.943

This should work for you:

Just go through each sub array with array_map() and sort() the arrays. Then simply return them implode()'ed. With the created array you can just use array_unique() and then explode() the values again.

<?php

    $result = array_map(function($v){
        return explode(",", $v);
    }, array_unique(array_map(function($v){
            sort($v);
            return implode(",", $v);
        }, $arr)));

    print_r($result);

?>

output:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

    [3] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 5
            [3] => 6
        )

)

score 0 · Answer 2 · answered May 29 '15 at 11:01

0

Another way to do it is

$filter = array();
$result = array_filter($array, function($e) use (&$filter) {
    $sum = array_sum($e);
    $ret = isset($filter[$sum]);
    $filter[$sum] = true;

    return !$ret;
});

Demo

answered May 29 '15 at 11:01

Federkun

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Narendrasingh Sisodia · Answer 3 · 2015-05-29T11:09:50.343

This must be the easy to understand

foreach($arr as $key => $value){
    sort($value);
    $arr[$key] = $value;
}
$result = array_unique($arr,SORT_REGULAR);
print_r($result);

Output:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

    [3] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 5
            [3] => 6
        )

)

DEMO

Unique values of the array with four fields

3 Answers3