I don't think a function that solves the same problem is in the PHP language, please correct me if I am wrong.
Anyways, I would appreciate any feedback that you can provide.
Thanks!
Code: Select all
class Rearranger
{
/*
* Determines how to move the specified value.
*/
public static function go($list, $indexToMove, $offset)
{
if(($offset == ($indexToMove - 1)) || ($offset == ($indexToMove + 1))) {
//Value is only being moved up or down one index, so just swap the values
$list = self::swap($list, $indexToMove, $offset);
} else if($offset < $indexToMove) {
//Value is being moved up (will be changing to a lower value index)
$list = self::move($list, $indexToMove, $offset);
} else if($offset > $indexToMove) {
//Value will be moving down (will be changing to a higher value index)
$list = self::move($list, $indexToMove, $offset - 1);
}
return $list;
}
/*
* Moves the value at $list[$indexToMove] in between
* $list[$offset - 1] and $list[$offset].
*/
public static function move($list, $indexToMove, $offset)
{
$container = $list[$indexToMove];
unset($list[$indexToMove]);
$list = array_values($list);
$list2 = array_slice($list, $offset);
$list = array_slice($list, 0, $offset);
array_push($list, $container);
return array_merge($list, $list2);
}
//Swap the values of two array indices
public static function swap($list, $indexA, $indexB)
{
$vA = $list[$indexA];
$vB = $list[$indexB];
$list[$indexA] = $vB;
$list[$indexB] = $vA;
return $list;
}
}
Code: Select all
$a1 = array('a', 'b', 'c', 'd', 'e', 'f');
echo 'Before Rearranging:';
var_dump($a1);
echo '4 to 1 (move up):';
$a1 = Rearranger::go($a1, 4, 1);
var_dump($a1);
echo '1 to 4 (move down):';
$a1 = Rearranger::go($a1, 1, 4);
var_dump($a1);
$a1 = Rearranger::go($a1, 2, 3);
echo '2 to 3 (swap):';
var_dump($a1);
echo '5 to 4 (swap):';
$a1 = Rearranger::go($a1, 5, 4);
var_dump($a1);
echo '3 to 3 (do nothing):';
$a1 = Rearranger::go($a1, 2, 2);
var_dump($a1);