Order multidimensional array recursively at each level in PHP

Question

I have an array of this form:

Array
(
    [first_level] => Array
        (
            [dir_3] => Array
                (
                    [subdir_1         


        

Answer 1

function ksort_recursive(&$array)
{
    if (is_array($array)) {
        ksort($array);
        array_walk($array, 'ksort_recursive');
    }
}

As noted in their comments, answers with return ksort() are incorrect as ksort() returns a success bool.

Note that this function does not throw "Warning: ksort() expects parameter 1 to be array" when given a non-array - this matches my requirements but perhaps not yours.

Answer 2

You need to use ksort.

// Not tested ...    
function recursive_ksort(&$array) {
    foreach ($array as $k => &$v) {
        if (is_array($v)) {
            recursive_ksort($v);
        }
    }
    return ksort($array);
}

Answer 3

Use a recursive function:

// Note this method returns a boolean and not the array
function recur_ksort(&$array) {
   foreach ($array as &$value) {
      if (is_array($value)) recur_ksort($value);
   }
   return ksort($array);
}