Count duplicate values in multidimensional array

Question

I need to count the same values in multidimensional array and remove the duplicates.

My array:

$r = [
    [\'a\',\'b\'],
    [\'a\',\'b\'],
    [\'c\',\'         


        

Answer 1

and the output:

array(3) {
  [0]=>
  array(3) {
    [0]=>
    string(1) "a"
    [1]=>
    string(1) "b"
    [2]=>
    int(2)
  }
  [1]=>
  array(3) {
    [0]=>
    string(1) "c"
    [1]=>
    string(1) "d"
    [2]=>
    int(3)
  }
  [2]=>
  array(3) {
    [0]=>
    string(1) "e"
    [1]=>
    string(1) "f"
    [2]=>
    int(1)
  }
}