sort array values by key using php

Question

i have an PHP array in the following format,

Array
(
    [0] => Array
        (
            [40] => 2
            [80] => 1
            [20] =>          


        

Answer 1

use ksort , which sorts an array by key

Assuming your array is $array

foreach($array as $a){
   foreach($a as $sort_me){
     ksort($sort_me);
   }
}

Answer 2

Use array_combine (http://php.net/manual/en/function.array-combine.php) to combine the arrays and then use ksort (http://php.net/manual/en/function.ksort.php) to sort the keys.