PHP unique array function for nested array

Question

Is there a way to use Array_unique function working for nested array like below? I want to get rid of date duplicates and get two dates out as an array...

Array
(
    [0] => Array
        (
            [value] => 1311044688
            [name] => 19th Jul 2011
        )

    [1] => Array
        (
            [value] => 1311044919
            [name] => 19th Jul 2011
        )

    [2] => Array
        (
            [value] => 1311045076
            [name] => 19th Jul 2011
        )

    [3] => Array
        (
            [value] => 1311164873
            [name] => 20th Jul 2011
        )

    [4] => Array
        (
            [value] => 1311165000
            [name] => 20th Jul 2011
        )

)

Can you post the result you want. I do not get how you want to remove one of the duplicate... how will you know which of the two to remove? — Patrick Desjardins
– Patrick Desjardins, Commented Jul 20, 2011 at 18:53

Parris Varney · Accepted Answer · 2011-07-20 18:56:18Z

5

I'd write this array to another array using the date as the keys, and the "values" as the value. That's probably the fastest way to achieve what you're looking for.

Something like:

$uniqueAry = array()
foreach ($ary as $item) {
  $uniqueAry[$item['name']] = $item['value'];
}

You'd probably want to include a bit of logic to determine which value takes precedence in case of dupes.

answered Jul 20, 2011 at 18:56

Parris Varney

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1 Comment

rzetterberg Over a year ago

Yes, this is the fastest way. 0(n) complexity.

Jim · Accepted Answer · 2011-07-20 18:54:17Z

0

You could build up an array of dates then use array_unique on the date array.

answered Jul 20, 2011 at 18:54

Jim

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