Creating unique arrays

Question

I have a multidimensional array such as

Array
(
    [0] => Array
        (
            [id] => 1355698
            [comment] => hello
        )

    [1] => Array
        (
            [id] => 1355699
            [comment] => hey
        )

    [2] => Array
        (
            [id] => 1355700
            [comment] => hello
        )

)

The id will always be unique, so the uniqueness of the element will be based on the subarray's value of comment. In this case, array[0] has a duplicate array[2]. (I wonder if there is a better way to phrase this explaination).

array_unique() will not work in this case. Is there an alternative? Thanks!

I believe this will answer your question: stackoverflow.com/questions/2442230/… — Mark1inLA
– Mark1inLA, Commented May 24, 2012 at 2:51
Follow Mark1inLA's answer and it leads to stackoverflow.com/questions/1861682/… - the accepted answer on that question should do exactly as you ask. — Robbie
– Robbie, Commented May 24, 2012 at 3:28
The accepted answer from stackoverflow.com/questions/1861682/… would use the comment as the array key. I don't think its a good solution for the problem, since a comment might have hundreds of characters. — flowfree
– flowfree, Commented May 24, 2012 at 5:26

flowfree · Accepted Answer · 2012-05-24 02:41:09Z

2

Create a new array with id and comment as key=>value pairs, then array_unique().

answered May 24, 2012 at 2:41

flowfree

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2 Comments

Joe Flynn Over a year ago

like: array( 1344698 => "hello", 1355699, => "hey", 1355700 => "hello");

Chris Henry Over a year ago

If you wind up with this solution, you'll also have a convenient way to access the comments without iterating.

deceze · Accepted Answer · 2012-05-24 02:55:08Z

0

$uniqueArray = array();
foreach ($nonUniqueArray as $i) {
    $uniqueArray[$i['comment']] = $i;
}

// optionally:
// $uniqueArray = array_values($uniqueArray);

var_dump($uniqueArray);

answered May 24, 2012 at 2:55

deceze♦

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