How do I randomly select a string from an array in swift?

How can I create a multi- dimensional array from a string?

• I have this string. $str = "a b c d"; I'd like to make a multi-dimensional array from it like this. $array = array("a" => array("b" => array("c" => array("d" => array())))); print_r($array); This page  http://stackoverflow.com/questions/4920515/how-can-i-create-multidimensional-arrays-from-a-string-in-php/4920691#4920691  suggests a solution for a different string format so I cannot wrap my head around.

• Answer:

  Okay, got it working. $str = "a b c d"; foreach (array_reverse(explode(" " , $str)) as $key => $value) $marr = array($value => isset($marr) ? $marr : array()); print_r($marr);