Array_Keys

        array(3) {
  [0]=>
  string(5) "Volvo"
  [1]=>
  string(3) "BMW"
  [2]=>
  string(6) "Toyota"
}
  
        

---

As you can see, indexed arrays are the same as associative arrays, but associative arrays have names instead of numbers:

        array(3) {
  ["brand"]=>
  string(4) "Ford"
  ["model"]=>
  string(7) "Mustang"
  ["year"]=>
  int(1964)
}