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? :)

Answer 1

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
        )

)