Switch two items in associative array

Question

Example:

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


        

Answer 1

Here's my version of the swap function:

function array_swap_assoc(&$array,$k1,$k2) {
  if($k1 === $k2) return;  // Nothing to do

  $keys = array_keys($array);  
  $p1 = array_search($k1, $keys);
  if($p1 === FALSE) return;  // Sanity check...keys must exist

  $p2 = array_search($k2, $keys);
  if($p2 === FALSE) return;

  $keys[$p1] = $k2;  // Swap the keys
  $keys[$p2] = $k1;

  $values = array_values($array); 

  // Swap the values
  list($values[$p1],$values[$p2]) = array($values[$p2],$values[$p1]);

  $array = array_combine($keys, $values);
}