/*
var_dump($array)-->

array(3) {
  [0]=>
  array(3) {
    ["rank"]=>
    string(1) "4"
    ["contestant_id"]=>
    string(3) "560"
    ["contestant"]=>
    string(12) "The Macarena"
  }
  [1]=>
  array(3) {
    ["rank"]=>
    string(1) "5"
    ["contestant_id"]=>
    string(3) "561"
    ["contestant"]=>
    string(16) "The Humpty Dance"
  }
  [2]=>
  array(3) {
    ["rank"]=>
    string(1) "8"
    ["contestant_id"]=>
    string(3) "564"
    ["contestant"]=>
    string(14) "The Hucklebuck"
  }
}

How can I check if in_array $array["rank"] ?

*/