Sorting a multidimensional array?

Question

I have an array that looks like this:

Array ( [0] => Array ( [filters] => Array ( [filter_1] => 1 
                                            [filt         


        

Answer 1

You'll need to use the uasort function. Try something like this:

function cmp($a, $b) {
    if ($a["count"] == $b["count"]) {
        return 0;
    }
    return ($a["count"] > $b["count"]) ? -1 : 1;
}

uasort($array, 'cmp');

Answer 2

You definitely want the usort function. You can define how the sort function determines which is larger or smaller.

If it's alright that each sub-array (of "filters" and "count") gets re-indexed, this should work perfectly. By re-indexed, I mean the newly sorted array would start at 0, progress to 1, etc. This is almost always how you want it, unless your original array is associative.

For example:

usort($array, "byCount");

function byCount($a, $b)
{
    if( $a['count'] == $b['count'] )
    {
        return 0;
    }
    return ($a['count'] < $b['count']) ? -1 : 1;
}