php - PHP清理排列数组

Question

大家好，基本上，我有一个数组：

array('a', 'b', 'c');

现在我通过一个数组置换函数运行它，结果是：

Array
(
    [0] => Array
        (
            [0] => C
        )

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

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

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

    [4] => Array
        (
            [0] => A
        )

    [5] => Array
        (
            [0] => A
            [1] => C
        )

    [6] => Array
        (
            [0] => C
            [1] => A
        )

    [7] => Array
        (
            [0] => A
            [1] => B
        )

    [8] => Array
        (
            [0] => B
            [1] => A
        )

    [9] => Array
        (
            [0] => A
            [1] => B
            [2] => C
        )

    [10] => Array
        (
            [0] => A
            [1] => C
            [2] => B
        )

    [11] => Array
        (
            [0] => B
            [1] => A
            [2] => C
        )

    [12] => Array
        (
            [0] => B
            [1] => C
            [2] => A
        )

    [13] => Array
        (
            [0] => C
            [1] => A
            [2] => B
        )

    [14] => Array
        (
            [0] => C
            [1] => B
            [2] => A
        )

)

现在我的问题是，我如何清理该数组以便：

array ( C, B )
is the same as
array ( B, C )

它删除了第二个数组

我该怎么做？

编辑...根据您的答案进行一些研究后，这就是我想出的：

array_walk($array, 'sort');
$array = array_unique($array);

sort($array); // not necessary

Answer 1

只需对组成数组进行排序：

foreach ($arrays AS &$arr)
{
   sort($arr);
}

所以 {"C", "B"} 变成 => {"B", "C"}
和 {"B", "C"} 变成 => {"B", "C"}

这是相同的。

Answer 2

array_multisort($array);
array_unique($array);

Answer 3

您还可以使用梨包Math_Combinatorics。

require_once 'Combinatorics.php';
$combinatorics = new Math_Combinatorics;
$a = array('a', 'b', 'c');

// creating and storing the combinations
for($combinations = array(), $n=1; $n<=count($a); $n++) {
  $combinations = array_merge($combinations, $combinatorics->combinations($a, $n));
}

// test output
foreach($combinations as $c) {
  echo join(', ', $c), "\n";
}

印刷

a
b
c
a, b
a, c
b, c
a, b, c