Switch two items in associative array

Question

Example:

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


        

Answer 1

I wrote a function with more general purpose, with this problem in mind.

1. array with known keys
2. specify order of keys in a second array ($order array keys indicate key position)

function order_array($array, $order) {

    foreach (array_keys($array) as $k => $v) {
        $keys[++$k] = $v;
    }
    for ($i = 1; $i <= count($array); $i++) {
        if (isset($order[$i])) {
            unset($keys[array_search($order[$i], $keys)]);
        }
        if ($i === count($array)) {
                    array_push($keys, $order[$i]);
                } else {
                    array_splice($keys, $i-1, 0, $order[$i]);
                }
            }
        }
        foreach ($keys as $key) {
            $result[$key] = $array[$key];
        }
        return $result;
    } else {
        return false;
    }
}

$order = array(1 => 'item3', 2 => 'item5');
$array = array("item1" => 'val1', "item2" => 'val2', "item3" => 'val3', "item4" => 'val4', "item5" => 'val5');

print_r($array); -> Array ( [item1] => val1 [item2] => val2 [item3] => val3 [item4] => val4 [item5] => val5 ) 

print_r(order_array($array, $order)); -> Array ( [item3] => val3 [item5] => val5 [item1] => val1 [item2] => val2 [item4] => val4 )

I hope this is relevant / helpful for someone