我想通过 PHP 在单个数组中列出所有可能的组合

这是"如何列出所有可能的组合？"的扩展问题。对于最后一个问题，它显示了所有排列而不是所有组合。

$num_array2 = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
foreach($num_array2 AS $value1) {
    foreach($num_array2 AS $value2) {
        if($value2 == $value1) {
            continue;
        }
        foreach($num_array2 AS $value3) {
            if($value3 == $value1 || $value3 == $value2) {
                continue;
            }
            foreach($num_array2 AS $value4) {
                if($value4 == $value1 || $value4 == $value2 || $value4 == $value3) {
                    continue;
                }
                foreach($num_array2 AS $value5) {
                    if($value5 == $value1 || $value5 == $value2 || $value5 == $value3 || $value5 == $value4) {
                        continue;
                    }
                    foreach($num_array2 AS $value6) {
                        if($value6 == $value1 || $value6 == $value2 || $value6 == $value3 || $value6 == $value4 || $value6 == $value5) {
                            continue;
                        }
                        echo "$value1, $value2, $value3, $value4, $value5, $value6 'n<br />";
                    }
                }
            }
        }
    }
}

结果将是：

1, 2, 3, 4, 5, 6 
1, 2, 3, 4, 5, 7 
1, 2, 3, 4, 5, 8 
1, 2, 3, 4, 5, 9 
1, 2, 3, 4, 5, 10 
1, 2, 3, 4, 6, 5 
1, 2, 3, 4, 6, 7 
1, 2, 3, 4, 6, 8 
1, 2, 3, 4, 6, 9 
1, 2, 3, 4, 6, 10 

和"1,2,3,4,6,5"被重复（尽管顺序不同）。我不希望显示"1、2、3、4、6、5"这样的结果。我应该如何修改代码？