Question

我有一个如下的aray，它是一个单维数组。我想使用product键作为值从此数组创建一个二维数组。

如何创建这样的多维数组？

我想获得一个二维数组，将所有产品密钥作为keyas，并将相应的记录作为值显示在下面

    Array
(
    [d9ef5a3cacbc] => Array{
        [0](
            [0] => God 
            [listitemname] => God 
            [1] => 20a3208eca59
            [upload_key] => 20a3208eca59
            [2] => d296772dd9045b1d99e0ff5a
            [file_key] => d296772dd9045b1d99e0ff5a
            [3] => a4e4eb6d7621e585d66b424ece08
            [folderkey] => a4e4eb6d7621e585d66b424ece08
            [4] => d9ef5a3cacbc
            [productkey] => d9ef5a3cacbc
            [5] => 1
            [file_type] => 1
        )
    [1] (
            [0] => God 
            [listitemname] => God 
            [1] => 877ede85abd9
            [upload_key] => 877ede85abd9
            [2] => 5a769542b3f75c78a6fd9bda
            [file_key] => 5a769542b3f75c78a6fd9bda
            [3] => dfcc7d5523de534dd1d148a67f6f
            [folderkey] => dfcc7d5523de534dd1d148a67f6f
            [4] => d9ef5a3cacbc
            [productkey] => d9ef5a3cacbc
            [5] => 2
            [file_type] => 2
        )
    [2]        (
            [0] => God 
            [listitemname] => God 
            [1] => 32d8dbdb7d31
            [upload_key] => 32d8dbdb7d31
            [2] => 413057623b1d11617e4eba71
            [file_key] => 413057623b1d11617e4eba71
            [3] => 3cd3bab180cc1ce6350ec6b29c46
            [folderkey] => 3cd3bab180cc1ce6350ec6b29c46
            [4] => d9ef5a3cacbc
            [productkey] => d9ef5a3cacbc
            [5] => 4
            [file_type] => 4
        )
    [3] (
            [0] => God 
            [listitemname] => God 
            [1] => 93854a71f69e
            [upload_key] => 93854a71f69e
            [2] => ddd697e3ec13dd49a987f17b
            [file_key] => ddd697e3ec13dd49a987f17b
            [3] => e41ff80e0a18b6cb4cf874730b52
            [folderkey] => e41ff80e0a18b6cb4cf874730b52
            [4] => d9ef5a3cacbc
            [productkey] => d9ef5a3cacbc
            [5] => 5
            [file_type] => 5


    }

    [4c8a0251e489] => Array{
        [0](
            [0] => Games
            [listitemname] => Games
            [1] => 17eec2f803be
            [upload_key] => 17eec2f803be
            [2] => 54f74c98ecb267ee5da74da1
            [file_key] => 54f74c98ecb267ee5da74da1
            [3] => dc035e3347f429f4b12d1af00d7a
            [folderkey] => dc035e3347f429f4b12d1af00d7a
            [4] => 4c8a0251e489
            [productkey] => 4c8a0251e489
            [5] => 1
            [file_type] => 1
        )
    [1] (
[0] => Games
            [listitemname] => Games
            [1] => 934380f97ae1
            [upload_key] => 934380f97ae1
            [2] => 684505352bb62e8c61ea8c8c
            [file_key] => 684505352bb62e8c61ea8c8c
            [3] => 2b86c8f004f97bad9600f0e23eed
            [folderkey] => 2b86c8f004f97bad9600f0e23eed
            [4] => 4c8a0251e489
            [productkey] => 4c8a0251e489
            [5] => 4
            [file_type] => 4
        )
    [2]        (
            [0] => Games
            [listitemname] => Games
            [1] => c85be159256e
            [upload_key] => c85be159256e
            [2] => eee3f59502b57e07fd83a9b1
            [file_key] => eee3f59502b57e07fd83a9b1
            [3] => 9ec2158c662b2c0068308bc461fa
            [folderkey] => 9ec2158c662b2c0068308bc461fa
            [4] => 4c8a0251e489
            [productkey] => 4c8a0251e489
            [5] => 5
            [file_type] => 5
        )

}

Answer 1

不确定你尝试了什么，但这看起来就像你需要的那样。

$res = array();

// assuming you want an array by product key
foreach($outer as $inner)
{
    $key = $inner['productKey'];
    if(!isset($res[$key]))
        $res[$key] = array();
    $res[$key][] = $inner;
}
// $res now holds what you're looking for

现在，看起来你正在寻找一些稍微复杂的东西：

function not_numeric($a){return !is_numeric($a);}

// you only care about the non-numeric keys of the arrays.
$keys = array_map('not_numeric', array_keys($outer[0]));
$res = array();
foreach($keys as $key)
{
   // same idea as above, only nested this time.
   if(!isset($res[$key]))
       $res[$key] = array();
   // this is exactly the same as the first example, only with an additional
   // lookup. You can make this better by judicious use of references, but
   // that is an exercise up to the reader.
   foreach($outer as $inner)
   {
        $inKey = $inner[$key];
        if(!isset($res[$key][$inKey]))
            $res[$key][$inKey] = array();
        $res[$key][$inKey][] = $inner;
   }
}

// $res now holds what you're looking for

正如观察一样，这种结构非常低效，虽然可以通过添加引用等来改进，但您可能需要重新考虑数据结构。

根据键从现有数组创建新数组

1 个答案: