如何从不同阵列创建所有可能性？

Question

Yes I know maybe the title is so similar but it's not same than the others. I think it can be done with a recursive function. But I could not do. For example I have three different arrays:

array('1')
array('a','b')
array('x', 'y', 'z')

I want to create a new array or output like this;

array(
  '1',
  '1a',
  '1b',
  '1x',
  '1y',
  '1z',
  '1ax',
  '1ay',
  '1az',
  '1bx', 
  '1by',
  '1bz'
)

And the main problem is I don't know how many arrays come out of the first array.

Answer 1

Is the order important? If it isn’t this should do the trick:

$array1 = array('1');
$array2 = array('a','b');
$array3 = array('x', 'y', 'z');

$result = array();

foreach ($array1 as $val) {
    foreach ($array2 as $val2) {
        foreach ($array3 as $val3) {
            $result[] = $val.$val2.$val3;
        }
        $result[] = $val.$val2;
    }
    $result[] = $val;
}

print_r($result);