从php中的两个数组生成所有组合

I have two array like these:

$a = array("abc","defs","ghi");
$b = array("abcs","def","ghis");

I want all the combination of strings like these:

abc defs ghi
abc def ghi
abc def ghis
abc defs ghis
abcs defs ghi
abcs def ghi
abcs def ghis
abcs defs ghis

How to do this in php?

PS - array can be of any length but both arrays size are always same.

PPS - The accepted answer given in this question is not giving me the correct result. It is giving the following result:

Array ( [0] => Array ( [0] => abc [1] => abcs ) [1] => Array ( [0] => abc [1] => def ) [2] => Array ( [0] => abc [1] => ghi ) [3] => Array ( [0] => defs [1] => abcs ) [4] => Array ( [0] => defs [1] => def ) [5] => Array ( [0] => defs [1] => ghi ) [6] => Array ( [0] => ghi [1] => abcs ) [7] => Array ( [0] => ghi [1] => def ) [8] => Array ( [0] => ghi [1] => ghi ) ) 

You need to convert your array to this,

$a    = ["abc", "defs", "ghi"];
$b    = ["abcs", "def", "ghis"];
$temp = array_map(null, $a, $b); // this conversion we call it transposing of array
function combinations($arrays)
{
    $result = [];
    $arrays = array_values($arrays);
    $sizeIn = sizeof($arrays);
    $size   = $sizeIn > 0 ? 1 : 0;
    foreach ($arrays as $array) {
        $size = $size * sizeof($array);
    }
    for ($i = 0; $i < $size; $i++) {
        $result[$i] = [];
        for ($j = 0; $j < $sizeIn; $j++) {
            array_push($result[$i], current($arrays[$j]));
        }
        for ($j = ($sizeIn - 1); $j >= 0; $j--) {
            if (next($arrays[$j])) {
                break;
            } elseif (isset($arrays[$j])) {
                reset($arrays[$j]);
            }
        }
    }
    return $result;
}
$res = combinations($temp);
// imploding all the values internally with space
$temp = array_map(function($item){
    return implode(" ", $item);
},$res);
// looping to show the data
foreach($temp as $val){
    echo $val."
";
}

Once you convert your array using array_map, then I used help of this.

Demo.

Output

abc defs ghi
abc defs ghis
abc def ghi
abc def ghis
abcs defs ghi
abcs defs ghis
abcs def ghi
abcs def ghis