PHP - Generate all possible combinations from multidimensional array

php-array-get-all-possibilities-associative.php

// http://www.devnetwork.net/viewtopic.php?f=1&t=133156
function array_cartesian_utm($arrays){
   
  //returned array...
  $cartesic = array();
 
  //calculate expected size of cartesian array...
  $size=(sizeof($arrays)>0)?1:0;
  foreach($arrays as $array){
      $size= $size*sizeof($array);
  }
  for($i=0; $i<$size;$i++) {
    $cartesic[$i] = array();

    foreach($arrays as $key=>$value){
      //die(var_dump($arrays[$j]));
        $current = current($arrays[$key]);
        //array_push($cartesic[$i], $current);
        $cartesic[$i][$key] = $current;  
    }

    //set cursor on next element in the arrays, beginning with the last array
    $arrays = array_reverse($arrays);
    foreach($arrays as $key=>$value){
      //if next returns true, then break
        if(next($arrays[$key])) {
            break;
        } else {    //if next returns false, then reset and go on with previuos array...
            reset($arrays[$key]);
        }  
    }
  }
  return $cartesic;
 }
 
 // example
$arrays['utm1'] = array("a", "b");
$arrays['utm2'] = array("x", "y", "z");
print_r(array_cartesian_utm($arrays));

php-array-get-all-possibilities-index.php

// http://www.devnetwork.net/viewtopic.php?f=1&t=133156
function array_cartesian_utm($arrays) {
   
    //returned array...
    $cartesic = array();
   
    //calculate expected size of cartesian array...
    $size=(sizeof($arrays)>0)?1:0;
    foreach($arrays as $array)
    {
        $size= $size*sizeof($array);
    }
    for($i=0; $i<$size;$i++) {
        $cartesic[$i] = array();
       
        for($j=0;$j<sizeof($arrays);$j++)
        {
            $current = current($arrays[$j]);
            array_push($cartesic[$i], $current);    
        }
        //set cursor on next element in the arrays, beginning with the last array
        for($j=(sizeof($arrays)-1);$j>=0;$j--)
        {
            //if next returns true, then break
            if(next($arrays[$j])) {
                break;
            } else {    //if next returns false, then reset and go on with previuos array...
                reset($arrays[$j]);
            }
        }
    }
    return $cartesic;
 }
 
// example
$arrays[0] = array("a", "b");
$arrays[1] = array("x", "y", "z");
print_r(array_cartesian_utm($arrays));

For the associative function :
To preserve the keys for numeric keys you need to change the ligne 23: $arrays = array_reverse($arrays,true);

But that doesn't works :(
The result is:
Array ( [0] => Array ( [utm1] => a [utm2] => x ) [1] => Array ( [utm2] => y [utm1] => a ) [2] => Array ( [utm1] => b [utm2] => y ) [3] => Array ( [utm2] => z [utm1] => b ) [4] => Array ( [utm1] => a [utm2] => x ) [5] => Array ( [utm2] => y [utm1] => a ) )
Combinations are: ax, ay, by, bz, ax, ay
Instead of: ax, ay, az, bx, by, bz