从PHP中的关联数组中获取唯一值？

Question

我正在使用下面的数组

Array
(
    [0] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [1] => Array
        (
            [catid] => 5
            [parent_id] => 2
            [catname] => Category 2
            [catdesc] => 
            [nleft] => 7
            [nright] => 8
            [nlevel] => 2
        )

    [2] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [3] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [4] => Array
        (
            [catid] => 7
            [parent_id] => 2
            [catname] => Flower
            [catdesc] => 
            [nleft] => 11
            [nright] => 18
            [nlevel] => 2
        )

    [5] => Array
        (
            [catid] => 8
            [parent_id] => 7
            [catname] => Lillies
            [catdesc] => 
            [nleft] => 12
            [nright] => 13
            [nlevel] => 3
        )

    [6] => Array
        (
            [catid] => 10
            [parent_id] => 7
            [catname] => Jasmine
            [catdesc] => 
            [nleft] => 16
            [nright] => 17
            [nlevel] => 3
        )

    [7] => Array
        (
            [catid] => 7
            [parent_id] => 2
            [catname] => Flower
            [catdesc] => 
            [nleft] => 11
            [nright] => 18
            [nlevel] => 2
        )

    [8] => Array
        (
            [catid] => 8
            [parent_id] => 7
            [catname] => Lillies
            [catdesc] => 
            [nleft] => 12
            [nright] => 13
            [nlevel] => 3
        )

    [9] => Array
        (
            [catid] => 10
            [parent_id] => 7
            [catname] => Jasmine
            [catdesc] => 
            [nleft] => 16
            [nright] => 17
            [nlevel] => 3
        )

    [10] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [11] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [12] => Array
        (
            [catid] => 10
            [parent_id] => 7
            [catname] => Jasmine
            [catdesc] => 
            [nleft] => 16
            [nright] => 17
            [nlevel] => 3
        )

    [13] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [14] => Array
        (
            [catid] => 8
            [parent_id] => 7
            [catname] => Lillies
            [catdesc] => 
            [nleft] => 12
            [nright] => 13
            [nlevel] => 3
        )

)

从这个数组我想得到Unique Arrays.ie.如果catId相同,则需要从列表中删除.我怎样才能做到这一点？

Answer 1

如果您使用的是旧版本:

$out = array();
foreach ($arr as $row) {
    $out[$row['catid']] = $row;
}
$array = array_values($out); // only required if you mind the new array being assoc