Permutation of Array PHP

Question

I have the following problem:

$multidmimensional = array(

 [0] => array(
    [0] => 1, 
    [1] => 2, 
    [2] => 3
  );


  [1] => array(
           


        

Answer 1

That's a nice brain teasing question. Here's what I came up with, see the running demo for testing and adjusting.

$multidimensional = array(
  0 => array(
    0 => 1,
    1 => 2,
    2 => 3,
  ),
  1 => array(
    0 => 5,
    1 => 6,
    2 => 7,
  ),
  2 => array(
    0 => 4,
    1 => 5,
  ),
); // just your input


$permutations = array();
$count = count($multidimensional);
for ($i = 0; $i < $count; $i++) {
  $temp = array_map("permute",array($permutations),array($multidimensional[$i]));
  $permutations = $temp[0];
}
print_r($permutations); // OUTPUT

function permute($base,$add) {
  $result = array();
  if (count($base) > 0) {
    foreach ($base AS $val1) {
      if (count($add) > 0) {
        foreach ($add AS $val2) {
          $result[] = $val1.$val2;
        }
      }
      else {
        $result = $base;
      }
    }
  }
  else {
    $result = $add;
  }
  return $result;
}