Get most frequent array inside a multidimensional array

Question

Problem:

I wish to get the array that is most reoccuring inside a multidimensional array. Google was not helpful this time around.

Sample array:

Array
(
    [1] => Array
        (
            [iata] => HAV
            [lat] => 22.9892
            [lng] => -82.4091
        )

    [2] => Array
        (
            [iata] => PEK
            [lat] => 40.0801
            [lng] => 116.585
        )

    [3] => Array
        (
            [iata] => HAV
            [lat] => 22.9892
            [lng] => -82.4091
        )
)

Desired output:

Array
(
    [iata] => HAV
    [lat] => 22.9892
    [lng] => -82.4091
)

@FelippeDuarte By iata key. That should have been in my description, sorry about that. — kexxcream
– kexxcream, Commented May 20, 2016 at 17:48
Even if other values are different? Or you want to compare all values and see which array is the most frequent? — Felippe Duarte
– Felippe Duarte, Commented May 20, 2016 at 17:51
Yes, even if other values are different. IATA codes are always unique so I won't have a problem down the road with comparing this value. — kexxcream
– kexxcream, Commented May 20, 2016 at 17:52

AbraCadaver · Accepted Answer · 2016-05-20 17:59:53Z

1

Here's one way:

$count  = array_count_values(array_column($array, 'iata'));
arsort($count);
$result = array_column($array, null, 'iata')[key($count)];

Get an array of the iata values and count those values
Sort them descending (preserving keys)
Get an array of the arrays indexed by iata value (they will be unique) and get the one with the key of the highest iata count value

answered May 20, 2016 at 17:59

AbraCadaver

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