谁能告诉这样一段js函数转php函数

[tao988]

t.number.each_combo = function (e, t) {
        var n = [];
        return function r(e, t, i) {
            if (i === 0) return n.push(e);
            for (var s = 0, o = t.length; s <= o - i; s++)r(e.concat(t[s]), t.slice(s + 1), i - 1);
        }([], e, t), n
    }

e为浮点数，比如1.1，2.2，3.3这样的数组 t为2或0之类的整数，要实现是
[
0: [
0: [1.1 ],
1: [2.2]
],
1:[
0:[1.1],
1:[3.3]
]
2:[
0:[2.2],
1:[3.3]
]

]

[xuzuning]

递归法求组合，直译即可

function combo($e, $t) {
  $n = [];
  $r = function($e, $t, $i) use (&$n, &$r){
    if($i === 0) return $n[] = $e;
    for($s=0,$o=count($t); $s<=$o-$i; $s++) $r(array_merge($e, [$t[$s]]), array_slice($t, $s+1), $i-1);
  };
  $r([], $e, $t);
  return $n;
}
print_r(combo([1,2,3,4],2));

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
        )

    [1] => Array
        (
            [0] => 1
            [1] => 3
        )

    [2] => Array
        (
            [0] => 1
            [1] => 4
        )

    [3] => Array
        (
            [0] => 2
            [1] => 3
        )

    [4] => Array
        (
            [0] => 2
            [1] => 4
        )

    [5] => Array
        (
            [0] => 3
            [1] => 4
        )

)

[tao988]

谢谢版主，版主果然厉害！ use (&$n, &$r)这里不懂什么意思？还是头一次见到在php中用use关键字！