PHP sort array alphabetically

Question

I'm struggling on this one. I have an array that contains countries and regions. I want to sort both sets of information in ascending order on the key.

Here is the array I'm working with:

Array
(
    [Country] => Array
        (
            [United Kingdom] => Array
                (
                    [London] => Array
                        (
                            [0] => 1
                            [1] => 5
                            [2] => 23
                            [3] => 71
                        )

                    [Manchester] => Array
                        (
                            [0] => 800
                        )

                )

            [United States] => Array
                (
                    [New York] => Array
                        (
                            [0] => 147
                            [1] => 111
                        )

                    [Washington] => Array
                        (
                            [0] => 213
                        )

                    [Florida] => Array
                        (
                            [0] => 6
                        )

                    [Texas] => Array
                        (
                            [0] => 9
                        )

                )

            [Brazil] => Array
                (
                    [Brasília] => Array
                        (
                            [0] => 64
                        )

                )

        )

)

So the reordered array would be:

Brazil
- Brasília

United Kingdom
- London
- Manchester

United States
- Florida
- New York
- Texas
- Washington

The data structure should remain the same, but the order of the number (e.g. London: 1,5,23,71) can stay the same.

I've tried several of the sorting methods from: http://php.net/manual/en/array.sorting.php

But they dont appear to do anything. Maybe because its a multidimensional array or maybe its not structured 100% logically... but I'm stuck with the array as it is.

Just for clarification purposes: Do you want the UK cities ordered in reverse order (M before L)? Or is that just a typo? — Steve
– Steve, Commented Mar 27, 2013 at 20:47
Hi Steve. Apologies, that was indeed a typo. I've corrected it now :) — iltdev
– iltdev, Commented Mar 27, 2013 at 21:23

Baba · Accepted Answer · 2013-03-27 20:49:12Z

5

You can try:

ksort_recursive($data);
print_r($data);

Function Used

function ksort_recursive(&$array) {
    ksort($array);
    foreach ( $array as &$a ) {
        is_array($a) && ksort_recursive($a);
    }
}

See Testing on Multiple PHP Versions

answered Mar 27, 2013 at 20:49

Baba

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1 Comment

iltdev Over a year ago

Thanks Baba. Your answer also works great. I accepted Steve's as it doesn't use a custom function and has fewer lines, but I really appreciate your answer :)

iltdev · Accepted Answer · 2013-03-27 21:39:52Z

2

Step 1:
Sort the country by key.

ksort($arr['Country']);

Step 2: Loop through the countries and sort those keys.

foreach ($arr['Country'] as $country=>$data) {
    ksort($arr['Country'][$country]);
}

edited Mar 27, 2013 at 21:39

iltdev

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answered Mar 27, 2013 at 20:48

Trenton Trama

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1 Comment

iltdev Over a year ago

Thanks Steve. I've made a couple of slight changes, but that is working a treat for me. Thanks :)

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