Find only duplicate values in associative array in php

Question

This is my array output -

print_r($array_email);

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

    [2] => Array
        (
            [0] => [email protected]
        )

    [3] => Array
        (
            [0] => [email protected]
        )

    [4] => Array
        (
            [0] => [email protected]
        )

)

Here i have tried - (but not working)

function get_duplicates( $array ) {
                return array_unique( array_diff_assoc( $array, array_unique( $array ) ) );
            }

print_r(get_duplicates($array_email));

I need output like that-

Array
    (
        [1] => Array
            (
                [1] => [email protected]
                [2] => [email protected]
                [4] => [email protected]
            )

        [2] => Array
            (
                [0] => [email protected]
            )
        [4] => Array
            (
                [0] => [email protected]
            )

    )

Aleksei Matiushkin · Accepted Answer · 2014-12-02 12:55:49Z

3

If I understood your requirement correctly:

array_map(function($elem) {
    return array_unique($elem);
});

answered Dec 2, 2014 at 12:55

Aleksei Matiushkin

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3 Comments

thecodedeveloper.com Over a year ago

Could you please explain me how to use it ?

CD001 Over a year ago

I may be completely misunderstanding the question, and I've certainly got no idea how the 2 arrays in the example given actually relate to each other... but doesn't this give the exact opposite of "Find duplicates" in that it removes them rather than finds them?

Aleksei Matiushkin Over a year ago

@vikastyagi This call returns the filtered array.

Alexander Guz · Accepted Answer · 2014-12-02 13:00:40Z

0

You have to do this:

array_walk($arr, function(&$value) {
    $value = array_unique($value);
});

$arr = array_unique($arr, SORT_REGULAR);

array_walk will remove duplicates inside inner arrays. array_unique will do the rest.

answered Dec 2, 2014 at 13:00

Alexander Guz

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