平面数组到多级结构-php数组

目前我有一张这样的表：

+-----------+---------------+-------------+-------------+
| category  | OrderID       | Name        | Name2       |
+-----------+---------------+-------------+-------------+
| ABC       | 12345         | Pen         | Black       |
+-----------+---------------+-------------+-------------+
| ABC       | 34545         | Pencil      | White       |   
+-----------+---------------+-------------+-------------+
| ABC       | 34545         | Pen         | Black       |
+-----------+---------------+-------------+-------------+
| DEF       | 12345         | Pencil      | Black       |
+-----------+---------------+-------------+-------------+
| DEF       | 12345         | Pen         | White       |
+-----------+---------------+-------------+-------------+

我喜欢用树的形式，我读了很多关于ref.和recursive的例子，但是没有掌握概念。有人能帮忙吗

由于表将是巨大的-可能约20K条记录-不确定递归是否会对性能等产生任何影响

由于客户端html小部件的限制，我必须以这种格式完成：

Array
(
[0] => Array
    (
        [category] => ABC
        [children] => Array
            (
            [0] => Array(
                [OrderID] => 12345
                [children] => Array
                    (
                        [Name] => Pen
                        [Name2] => Black

                    )
            )
            [1] => Array(
                [OrderID] => 34545
                [children] => Array
                (
                    [0] => Array(
                        [Name] => Pencil
                        [Name2] => White
                    )
                    [1] => Array(
                        [Name] => Pen
                        [Name2] => White
                    )
                )
            )

    )

[1] => Array
    (
        [category] => DEF
        [children] => Array
            (
                [OrderID] => 12345
                [children] => Array
                (
                    [0] => Array(
                        [Name] => Pencil
                        [Name2] => Black
                    )
                    [1] => Array(
                        [Name] => Pen
                        [Name2] => White
                    )
                )
            )
    )

---

在许多情况下，将需要分组的值放入数组内容中不是一个好主意，因为不能将该值用作查找键，从而使分组更加困难和低效

$ori=json_decode(<<<JSON
[{"category":"ABC","orderID":"12345","Name":"Pen","Name2":"Black"},
{"category":"ABC","orderID":"34545","Name":"Pencil","Name2":"White"},
{"category":"ABC","orderID":"34545","Name":"Pen","Name2":"Black"},
{"category":"DEF","orderID":"12345","Name":"Pencil","Name2":"Black"},
{"category":"DEF","orderID":"12345","Name":"Pen","Name2":"White"}]
JSON
,true);
$result=array();
while($row=array_shift($ori))//Pretend that we're fetching record from DB
{
    $result[$row["category"]][$row["orderID"]][]=array("Name"=>$row["Name"],"Name2"=>$row["Name2"]);
}
print_r($result);

您仍然可以获得相同的

count（）

结果，并且可以更轻松地找到特定类别和顺序：

$result[category][order][Name]=…

但如果您坚持要获得所需的格式，您仍然可以添加：

array_walk($result,function(&$v,$k){
    $x=array("category"=>$k,"children"=>array());
    array_walk($v,function($arr,$oid)use(&$x){
        $x["children"][]=array("orderID"=>$oid,"children"=>$arr);
    });
    $v=$x;
});
print_r(array_values($result));

这将产生：

数组
(
[0]=>阵列
(
[类别]=>ABC
[子项]=>数组
(
[0]=>阵列
(
[orderID]=>12345
[子项]=>数组
(
[0]=>阵列
(
[名称]=>钢笔
[Name2]=>黑色
)
)
)
[1] =>阵列
(
[orderID]=>34545
......

---

.Anonymous函数要求PHP>=5.3

您现在还没有尝试过任何东西…将此问题从主题中删除，因为使用“ABC”“DEF”时，问题应显示出对主题的最低理解作为数组的键，访问和插入都会更好。如上所述，您应该尝试一下，理解这个概念并不困难。