Why multisort works only in the first depth of array?

Question

I thought that the function array_multisort can sort multidimensional array, but this code does not work.

Code:

$values = array(0, 2, 1, array(0, 2, 1));
array_multisort($values, SORT_ASC);
var_dump($values);

Return:

array(4) [
   0 => 0
   1 => 1
   2 => 2
   3 => array(3) [
      0 => 0
      1 => 2 //should be 1
      2 => 1 //should be 2
   ]
]

Why the array in array is not sorted? Thanks

Answer 1

You can try

sort_recursive($values);
var_dump($values);

Output

array (size=4)
  0 => int 0
  1 => int 1
  2 => int 2
  3 => 
    array (size=3)
      0 => int 0
      1 => int 1
      2 => int 2

Function Used

function sort_recursive(&$array) {
    sort($array);
    foreach ( $array as &$v ) {
        is_array($v) and sort_recursive($v);
    }
}

Answer 2

is because the array() is in a multidimentional form

try this link to see how to sort multidimensional array click here