Reverse alphabetic sort multidimensional PHP array maintain key

Question

I'm dying here, any help would be great.

I've got an array that I can sort a-z on the value of a specific key but cannot sort in reverse z-a.

sample of my array which i'd like to sort by ProjectName (z-a):

Array
( 
 [0] => Array
    (
        [count] => 1
        [ProjectName] => bbcjob
        [Postcode] => 53.471922,-2.2996078
        [Sector] => Public

    )

[1] => Array
    (
        [count] => 1
        [ProjectName] => commercial enterprise zone
        [Postcode] => 53.3742081,-1.4926439
        [Sector] => Public

    )

[2] => Array
    (
        [count] => 1
        [ProjectName] => Monkeys eat chips
        [Postcode] => 51.5141492,-0.2271227
        [Sector] => Private

the desired results would be to maintain the entire array key -> value structure but with the order:

Monkeys eat chips
Commericial enterprise zone
bbcjob

I hope this makes sense

So show us the code you use to sort A-Z, and we'll show you how to change it so it will sort Z-A — Mark Baker
– Mark Baker, Commented Nov 3, 2013 at 21:40
I used function name_sort($x, $y) { return strcasecmp($x['ProjectName'], $y['ProjectName']); } and ran this through uasort with the array — useyourillusiontoo
– useyourillusiontoo, Commented Nov 3, 2013 at 21:51
Just reverse the sign of the returned value: _sort($x, $y) { return -(strcasecmp($x['ProjectName'], $y['ProjectName'])); } or reverse the order of the arguments: _sort($y, $x) { return strcasecmp($x['ProjectName'], $y['ProjectName']); } — Mark Baker
– Mark Baker, Commented Nov 3, 2013 at 21:55
Cheers Mark, can't believe i didn't think of that. Defo a case of staring at a problem too long. :) — useyourillusiontoo
– useyourillusiontoo, Commented Nov 3, 2013 at 22:02

Fluffeh · Accepted Answer · 2013-11-03 21:51:37Z

3

This is a job for usort which lets you define a function to do your comparison and then sort the array based on that.

function cmp($a, $b)
{
    return strcmp($b["ProjectName"], $a["ProjectName"]);
}

usort($yourArray, "cmp");

print_r($yourArray);

Edit: based on your comment, you should just reverse the $x and $y in your function to reverse the order of the sorting performed.

function name_sort($x, $y) 
{
    return strcasecmp($y['ProjectName'], $x['ProjectName']); 
}

edited Nov 3, 2013 at 21:51

answered Nov 3, 2013 at 21:40

Fluffeh

33.6k16 gold badges69 silver badges80 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Reverse alphabetic sort multidimensional PHP array maintain key

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related