find duplicates value with their keys

Question

My array is like this,

$options = Array
    (
    [0] => Array
        (
            [value] => 180
            [label] => Nokia
        )

    [1] => Array
        (
            [value] => 2341
            [label] => Suisses
        )

    [2] => Array
        (
            [value] => 143
            [label] => Nokia
        )
     [3] => Array
        (
            [value] => 2389
            [label] => 3D Pop Art 
        )
    )

and i want output as,

Array(
[0] => Array
        (
            [value] => 180
            [label] => Nokia
        )
[2] => Array
        (
            [value] => 143
            [label] => Nokia
        )
)

Can anyone suggest me in this.

https://stackoverflow.com/questions/4948946/php-check-for-duplicate-values-in-a-multidimensional-array <- this helps ? — nice_dev, Sep 26 '19 at 07:46
Possible duplicate of [PHP: Check for duplicate values in a multidimensional array](https://stackoverflow.com/questions/4948946/php-check-for-duplicate-values-in-a-multidimensional-array) — Rob Streeting, Sep 26 '19 at 08:03

score 0 · Answer 1 · answered Sep 26 '19 at 07:51

You can try something like this:

$options = [
    0 => [
            'value' => 180,
            'label' => 'Nokia'
        ],

    1 => [
            'value' => 2341,
            'label' => 'Suisses'
        ],

    2 => [
            'value' => 143,
            'label' => 'Nokia'
        ],
     3 => [
            'value' => 2389,
            'label' => '3D Pop Art'
        ],
];

$labels = [];
$duplicates = [];
foreach ($options as $option) {
    if (!empty($duplicates[$option['label']])) {
        $duplicates[$option['label']][] = $option;
    }

    if (empty($labels[$option['label']])) {
        $labels[$option['label']] = $option;
    } else {
        $duplicates[$option['label']] = [
            $labels[$option['label']],
            $option
        ];
    }
}

score 0 · Answer 2 · answered Sep 26 '19 at 07:51

0

It seems you are looking for group by 'label'

 foreach($options as $v){
  $c[$v['label']][] = $v['value'];
 }
 print_r($c);

Working example : https://3v4l.org/62dv0

answered Sep 26 '19 at 07:51

Rakesh Jakhar

6,380
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arkascha · Answer 3 · 2019-09-26T08:12:54.717

The array_filter() function is what you are looking for:

<?php
$data = [
    [
        'value' => 180,
        'label' => "Nokia"
    ],
    [
        'value' => 2341,
        'label' => "Suisses"
    ],
    [
        'value' => 143,
        'label' => "Nokia"
    ],
    [
        'value' => 2389,
        'label' => "3D Pop Art"
    ]
];
$output = [];
array_walk($input, function($entry) use (&$output) {
    $output[$entry['label']][] = $entry;
});

print_r(
    array_filter(
        $output, 
        function($entry) {
            return count($entry) > 1;
        }
    )
);

The output obviously is:

Array
(
    [Nokia] => Array
        (
            [0] => Array
                (
                    [value] => 180
                    [label] => Nokia
                )

            [1] => Array
                (
                    [value] => 143
                    [label] => Nokia
                )

        )
)

That output slightly differs from the one suggested by you. But it has the advantage that you can tell entries apart by the doubled label.

find duplicates value with their keys

3 Answers3