PHP Array unique values

Question

I have an array like this

Array
(
    [0] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [1] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [2] => Array
        (
            [id] => LA
            [name] => Lanchile
        )

    [3] => Array
        (
            [id] => LA
            [name] => Lanchile
        )

    [4] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [5] => Array
        (
            [id] => BA
            [name] => British Airways
        )

)

and i want to get

Array
(
    [0] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [1] => Array
        (
            [id] => LA
            [name] => Lanchile
        )
)

but after using array_unique function, all i have is

Array
(
    [0] => Array
        (
            [id] => BA
            [name] => British Airways
        )

)

what am i doing wrong?

Possible duplicate - stackoverflow.com/q/307674/608170. Also if this array is the result of a query, you need to recheck your query so as to eliminate the duplicates. — verisimilitude
– verisimilitude, Commented May 3, 2013 at 11:26
possible duplicate of stackoverflow.com/questions/6766942/… — Linga
– Linga, Commented May 3, 2013 at 11:27
Dont know how to mark comment as an answer, but 'diegoperini' you right, array_unique(my_array, SORT_REGULAR) + sort() solved the problem! :) — Littlebobbydroptables
– Littlebobbydroptables, Commented May 3, 2013 at 13:09
Wish I saw these comments 1 hour earlier. I don't think you can mark comments as an answer. You should answer the question yourself, give @diegoperini credit and mark the answer as completed. — Niklas Ekman
– Niklas Ekman, Commented Jul 29, 2013 at 14:43

diegoperini · Accepted Answer · 2013-07-29 14:47:00Z

19

array_unique(my_array, SORT_REGULAR)

As requested in comments. :)

answered Jul 29, 2013 at 14:47

diegoperini

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2 Comments

Arthur Kushman Over a year ago

U would rather say - Great "steallution" lol Upvoted diegoperini in deep concern of justice.

diegoperini Over a year ago

I misread Niklas Ekman's suggestion that day and now I realize it was stealing. Apologies for the inconvenience. I upvoted the question instead.

fullybaked · Accepted Answer · 2013-05-03 11:29:09Z

As mentioned array_unique doesn't support multi dimensional arrays, but you could iterate over the data and build your own

<?php
$airlines = array(
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
);
$tmp = array();
foreach ($airlines as $item) {
    if (!in_array($item['id'], $tmp)) {
        $unique[] = $item;
        $tmp[] = $item['id'];
    }
}

var_dump($unique); // $unqiue will have your desired results in it var_dump was just for testing

Community · Accepted Answer · 2023-11-17 19:53:52Z

2

 array_unique is not intended to work on multi dimensional arrays.

You need to loop the array

array_unique

edited Nov 17, 2023 at 19:53

CommunityBot

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answered May 3, 2013 at 11:25

Shijin TR

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Comments

Mark Baker · Accepted Answer · 2013-05-03 11:35:59Z

1

$airlines = array(
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
);


$unique = array_map(
    'unserialize',
    array_unique(
        array_map(
            'serialize',
            $airlines
        )
    )
);

var_dump($unique);

answered May 3, 2013 at 11:35

Mark Baker

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1 Comment

cleong Over a year ago

That would fail if the order of the elements are different. array_unique($airlines, SORT_REGULAR); is the correct answer.

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