How to merge these two arrays?

Question

I want to merge those two arrays and get only the unique key values. Is there a php function for this? array_merge() doesn't work.

Array
(
    [1] => 3
    [2] => 4
    [3] => 1


)

Array
(
    [1] => 3
    [2] => 1
    [3] => 2

)

RESULT ARRAY THAT I WANT

Array
(
    [1] => 1
    [2] => 2
    [3] => 3
    [4] => 4

)

Do you want the *keys only* or the *values* for the keys (in which case I assume the value for a given key is going to be the same in both arrays)? — Jon, Sep 08 '11 at 08:02
the arrays merged with unique keys values. For example I don't want the [16] => 16 to appear two times — chchrist, Sep 08 '11 at 08:03
This doesnt clarify it for me. Please give a full example output. Also see [+ operator for arrays](http://stackoverflow.com/questions/2140090/operator-for-array-in-php) — Gordon, Sep 08 '11 at 08:04
Also: give the *smallest* example that explains what you need. There's no need to put 15 elements in each array to illustrate. — Jon, Sep 08 '11 at 08:07

Arnaud Le Blanc · Accepted Answer · 2011-09-08T08:21:49.353

4

$values = array_unique(array_merge($array1, $array2));
sort($values);

This returns the unique values from array1 and array2 (as per your example).

Try it here: http://codepad.org/CeZewRNT

See array_merge() and array_unique().

edited Sep 08 '11 at 08:21

answered Sep 08 '11 at 08:01

Arnaud Le Blanc

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Alfwed · Answer 2 · 2011-09-08T08:21:08.950

3

$merged = array_unique(array_merge($array1, $array2));

edited Sep 08 '11 at 08:21

answered Sep 08 '11 at 08:03

Alfwed

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score 1 · Answer 3 · answered Sep 08 '11 at 08:37

Following peice of code gives exact what you wants but the question is do you really want the keys in the result are starting from 1 instead of 0? If you don't Arnaud his option is the best solution.

$array1 = array(
    1 => 3,
    2 => 4,
    3 => 1
);

$array2 =  array(
    1 => 3,
    2 => 1,
    3 => 2
);

$values = array_unique(array_merge($array1, $array2));
$keys = array_keys(array_fill_keys($values, ''));
$result = array_combine($keys, $values);
asort($result);

var_dump($result);

score 0 · Answer 4 · edited Sep 08 '11 at 08:32

0

Try this:

$merged = array_unique(array_merge($array1, $array2));

edited Sep 08 '11 at 08:32

Gordon

312,688
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answered Sep 08 '11 at 08:01

Niko

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How to merge these two arrays?

4 Answers4