Switch two items in associative array

Question

Example:

$arr = array(
  \'apple\'      => \'sweet\',
  \'grapefruit\' => \'bitter\',
  \'pear\'       => \'tasty\',
  \'banana\'     => \'yellow\'
)         


        

Answer 1

Well it's just a key sorting problem. We can use uksort for this purpose. It needs a key comparison function and we only need to know that it should return 0 to leave keys position untouched and something other than 0 to move key up or down.

Notice that it will only work if your keys you want to swap are next to each other.

 'sweet',
  'grapefruit' => 'bitter',
  'pear'       => 'tasty',
  'banana'     => 'yellow'
);

uksort(
    $arr,
    function ($k1, $k2) {
        if ($k1 == 'grapefruit' && $k2 == 'pear') return 1;
        else return 0;
    }
);

var_dump($arr);