array_flip certain keys

What would be a good way of fliping key 1 with key 2?

// original
Array
(
    [0] => Text1
    [1] => World
    [2] => Hello
)

// after

Array
(
    [0] => Text1
    [1] => Hello
    [2] => World
)

Any clues. Thanks

From stackoverflow

• If it's a simple as that,

  $tmp = $array[1];
  $array[1] = $array[2];
  $array[2] = $tmp;
  

• $A = array("Text1", "Hello", "World");
  $tmp = $A[2];
  $A[2] = $A[1];
  $A[1] = $tmp;