Question

我有一些代码可以创建一个多维数组，但我的结果似乎是一个数组数组，这不是我想要的。我想压扁这个数组。如何更改此数组结果：

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [2011-11-18 00:00:00] => C
                )

            [1] => Array
                (
                    [2011-11-18 00:00:00] => I
                )

            [2] => Array
                (
                    [2011-11-18 00:00:00] => S
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [2011-11-22 00:00:00] => C
                )

            [1] => Array
                (
                    [2011-11-22 00:00:00] => S
                )

        )

)

进入不是“数组数组”的东西？以下是创建数组数组的代码：

$qrybilled = $this->db->query("SELECT tbltc.BILLED FROM tbltc WHERE tbltc.PN = $pn AND tbltc.Y = $taxyear AND tbltc.SCENARIO = $scenario GROUP BY BILLED");
$x = 0; $arr_billed = array();

foreach ($qrybilled->result() as $row) {
$qry = $this->db->query("SELECT tbltc.BILLED, tbltc.TC, tbltc.CAT FROM tbltc WHERE tbltc.PN = $pn AND tbltc.Y = $taxyear AND tbltc.SCENARIO = $scenario AND tbltc.BILLED = '".$row->BILLED."' GROUP BY TC");

    $tmp = array();
    foreach ($qry->result() as $row) {      
        $tmp[] = array( $row->BILLED => $row->TC);
    }
    $arr_billed[] = $tmp; 

}
$data['billed'] = $arr_billed;

如果您可以建议一种更好的方法来构建数组，使其不是“数组数组”，那就太棒了。谢谢你的帮助。

编辑 -

NickB的答案对我来说非常合适，并产生了以下输出，这正是我所寻求的：

Array
(
    [2011-11-18 00:00:00] => Array
        (
            [0] => C
            [1] => I
            [2] => S
        )

    [2011-11-22 00:00:00] => Array
        (
            [0] => C
            [1] => S
        )

)

Answer 1

您可以循环遍历数组中的所有条目以创建新数组。

$result = array();

foreach( $array as $inner_array)
{
    foreach( $inner_array as $entry)
    {
        foreach( $entry as $key => $value)
        {
            $result[ $key ][] = $value;
        }
    }
}

<强>输出：

array(2) {
  ["2011-11-18 00:00:00"]=>
  array(3) {
    [0]=>
    string(1) "C"
    [1]=>
    string(1) "I"
    [2]=>
    string(1) "S"
  }
  ["2011-11-22 00:00:00"]=> 
  array(2) {
    [0]=>
    string(1) "C"
    [1]=>
    string(1) "S"
  }
}

Answer 2

虽然在同一个数组中使用同一个键不止一个，但您可以返回一个更简单（但仍然是嵌套）的结构（一对对象列表 - 正如某些语言所称的那样）。

假设您的数据被称为$data：

$compactData = array();
array_walk_recursive($data, function($value, $key) use (&$compactData) {
    $compactData[] = array($key, $value);
});

print_r($compactData);

打印：

Array
(
    [0] => Array
        (
            [0] => 2011-11-18 00:00:00
            [1] => C
        )

    [1] => Array
        (
            [0] => 2011-11-18 00:00:00
            [1] => I
        )

    [2] => Array
        (
            [0] => 2011-11-18 00:00:00
            [1] => S
        )

    [3] => Array
        (
            [0] => 2011-11-22 00:00:00
            [1] => C
        )

    [4] => Array
        (
            [0] => 2011-11-22 00:00:00
            [1] => S
        )

)

更改多维数组的结构

2 个答案: