PHP sort the multidimesnion array by applying two level of sorting

Question

I have an Array:

array(5) {
  [A] => array(2) {
    [price] => string(3) "800"
    [score] => string(1) "8"
  }
  [B] => array(2) {
    [price] => string(3) "800"
    [score] => string(2) "10"
  }
  [C] => array(2) {
    [price] => string(3) "800"
    [score] => string(2) "15"
  }
  [D] => array(2) {
    [price] => string(4) "1800"
    [score] => string(1) "4"
  }
  [E] => array(2) {
    [price] => string(4) "2800"
    [score] => string(1) "5"
  }
}

I have successfully sorted based on the price (ASC Order) by following: this

Problem is i need to apply second level sorting too based on the score if price is same (Highest score should come first).

The required array needed should be like:

array(
    5) {
      [C] => array(2) {
        [price] => string(3) "800"
        [score] => string(2) "15"
      }
      [B] => array(2) {
        [price] => string(3) "800"
        [score] => string(2) "10"
      }
      [A] => array(2) {
        [price] => string(3) "800"
        [score] => string(1) "8"
      }
      [D] => array(2) {
        [price] => string(4) "1800"
        [score] => string(1) "4"
      }
      [E] => array(2) {
        [price] => string(4) "2800"
        [score] => string(1) "5"
      }
    }

Not able to think which way i have to go. Can someone please help here.