PHP: Get all combinations of multiple arrays (preserves keys)

get_combinations.php

<?php

function get_combinations($arrays) {
	$result = array(array());
	foreach ($arrays as $property => $property_values) {
		$tmp = array();
		foreach ($result as $result_item) {
			foreach ($property_values as $property_value) {
				$tmp[] = array_merge($result_item, array($property => $property_value));
			}
		}
		$result = $tmp;
	}
	return $result;
}

$combinations = get_combinations(
	array(
		'item1' => array('A', 'B'),
		'item2' => array('C', 'D'),
		'item3' => array('E', 'F'),
	)
);

var_dump($combinations);

?>

output.txt

array (size=8)
  0 => 
    array (size=3)
      'item1' => string 'A' (length=1)
      'item2' => string 'C' (length=1)
      'item3' => string 'E' (length=1)
  1 => 
    array (size=3)
      'item1' => string 'A' (length=1)
      'item2' => string 'C' (length=1)
      'item3' => string 'F' (length=1)
  2 => 
    array (size=3)
      'item1' => string 'A' (length=1)
      'item2' => string 'D' (length=1)
      'item3' => string 'E' (length=1)
  3 => 
    array (size=3)
      'item1' => string 'A' (length=1)
      'item2' => string 'D' (length=1)
      'item3' => string 'F' (length=1)
  4 => 
    array (size=3)
      'item1' => string 'B' (length=1)
      'item2' => string 'C' (length=1)
      'item3' => string 'E' (length=1)
  5 => 
    array (size=3)
      'item1' => string 'B' (length=1)
      'item2' => string 'C' (length=1)
      'item3' => string 'F' (length=1)
  6 => 
    array (size=3)
      'item1' => string 'B' (length=1)
      'item2' => string 'D' (length=1)
      'item3' => string 'E' (length=1)
  7 => 
    array (size=3)
      'item1' => string 'B' (length=1)
      'item2' => string 'D' (length=1)
      'item3' => string 'F' (length=1)

Thanks! :)