Remove duplicates from a multi-dimensional array in PHP

Question

I would like to now how to remove duplicates from a multi-dimensional array. I have an array which looks like this:

Array before

Array
(
    [0] => Array
    (
        [0] => 'Hello'
        [1] => 'Test'
    )

    [1] => Array
    (
        [0] => 'Friend'
        [1] => 'Test'
    )

    [2] => Array
    (
        [0] => 'Hello'
        [1] => 'Code'
    )

    [3] => Array
    (
        [0] => 'Hello'
        [1] => 'Test'
    )

    [4] => Array
    (
        [0] => 'hello'
        [1] => 'Test'
    )

    [5] => Array
    (
        [0] => 'Hello'
        [1] => 'Test'
    )
)

And i want it to look like this:

Array after

Array
(
    [0] => Array
    (
        [0] => 'Hello'
        [1] => 'Test'
    )

    [1] => Array
    (
        [0] => 'Friend'
        [1] => 'Test'
    )

    [2] => Array
    (
        [0] => 'Hello'
        [1] => 'Code'
    )

    [3] => Array
    (
        [0] => 'hello'
        [1] => 'Test'
    )
)

As you see, the third and fith element got removed because element zero is identical with them. What is the most efectiv way to solve this? Thank you.

Possible duplicate of How to remove duplicate values from a multi-dimensional array in PHP — Nico Haase
– Nico Haase, Commented Feb 24, 2018 at 9:33

The fourth bird · Accepted Answer · 2018-02-24 09:29:50Z

You might use array_unique.

Php output demo

$arrays = [
    [
        "Hello",
        "Test"
    ],
    [
        "Friend",
        "Test"
    ],
    [
        "Hello",
        "Test"
    ],
    [
        "hello",
        "Test"
    ]
];

var_dump(array_unique($arrays, SORT_REGULAR));

That would give you:

array(3) {
  [0]=>
  array(2) {
    [0]=>
    string(5) "Hello"
    [1]=>
    string(4) "Test"
  }
  [1]=>
  array(2) {
    [0]=>
    string(6) "Friend"
    [1]=>
    string(4) "Test"
  }
  [3]=>
  array(2) {
    [0]=>
    string(5) "hello"
    [1]=>
    string(4) "Test"
  }
}

acontell · Accepted Answer · 2018-02-24 09:31:03Z

0

Another solution could be:

$myArray = array_map("unserialize", array_unique(array_map("serialize", $array)));

You can try it here:

https://repl.it/repls/TrueToughRotation

answered Feb 24, 2018 at 9:31

acontell

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Comments

Narendra Solanki · Accepted Answer · 2018-02-24 09:32:50Z

0

Here is another way. No intermediate variables are saved.

We used this to de-duplicate results from a variety of overlapping queries.

$input = array_map("unserialize",array_unique(array_map("serialize", $input)));

answered Feb 24, 2018 at 9:32

Narendra Solanki

1,21216 silver badges22 bronze badges

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