Sort array using two values [duplicate]

Question

I am trying to sort an array using two values (order, sub_order) so that they are orders like 1.1, 1.2, 2.1, 2.1.

Below is an example of the array as it is now and the second is the array sorted correctly by the order and sub_order values.

Array
(
    [0] => Array
        (
            [id] => 1
            [order] => 1
            [sub_order] => 2
            [title] => Blah 
        )

    [1] => Array
        (
            [id] => 3
            [order] => 2
            [sub_order] => 2
            [title] => Blah 
        )

    [2] => Array
        (
            [id] => 2
            [order] => 1
            [sub_order] => 1
            [title] => Blah 
        )

    [3] => Array
        (
            [id] => 4
            [order] => 2
            [sub_order] => 1
            [title] => Blah 
        )

)

Ordered correctly...

Array
(
    [0] => Array
        (
            [id] => 2
            [order] => 1
            [sub_order] => 1
            [title] => Blah 
        )

    [1] => Array
        (
            [id] => 1
            [order] => 1
            [sub_order] => 2
            [title] => Blah 
        )

    [2] => Array
        (
            [id] => 4
            [order] => 2
            [sub_order] => 1
            [title] => Blah 
        )

    [3] => Array
        (
            [id] => 3
            [order] => 2
            [sub_order] => 2
            [title] => Blah 
        )

)

Any help would be great.

Have you tried writing a usort function to sort it yourself? — scragar
– scragar, Commented May 29, 2014 at 13:20

Halcyon · Accepted Answer · 2014-05-29 13:20:21Z

3

Use usort

usort($array, "order_sub_order_sort");
function order_sub_order_sort($a, $b) {
    if ($a["order"] != $b["order"]) {
        return $a["order"] - $b["order"];
    }
    return $a["sub_order"] - $b["sub_order"]
}

Change $a-$b for $b-$a if you want to sort the other way around. I always forget which is ascending and which is descending.

answered May 29, 2014 at 13:20

Halcyon

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1 Comment

Oscar M. Over a year ago

Nicely done. If order_sub_order_sort is one-time use, you can even just use an anonymous function as the second parameter to usort.

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