PHP数组【排序+分组】

Question

如何在 PHP 中使用条件对数组进行排序？ 我希望数组按 ID 排序，然后按父 ID 在 ID 内而不是在 ID 之后排序。 这样做的原因是将其实现到 jQuery TreeGrid 中。

例如：

Array 
(
[0] => Array
    (
        [0] => 1 //ID
        [1] => TEST //Name
        [2] => 1 //Parent ID
    )
[1] => Array
    (
        [0] => 2 //ID
        [1] => TEST //Name
        [2] => 2 //Parent ID
    )
[2] => Array
    (
        [0] => 3 //ID
        [1] => TEST //Name
        [2] => 3 //Parent ID
    )
[3] => Array
    (
        [0] => 4 //ID
        [1] => TEST //Name
        [2] => 1 //Parent ID
    )
[4] => Array
    (
        [0] => 5 //ID
        [1] => TEST //Name
        [2] => 2 //Parent ID
    )
)

排序后变成这样：

Array 
(
[0] => Array
    (
        [0] => 1 //ID
        [1] => TEST //Name
        [2] => 1 //Parent ID
    )
[1] => Array
    (
        [0] => 4 //ID
        [1] => TEST //Name
        [2] => 1 //Parent ID
    )
[2] => Array
    (
        [0] => 2 //ID
        [1] => TEST //Name
        [2] => 2 //Parent ID
    )
[3] => Array
    (
        [0] => 5 //ID
        [1] => TEST //Name
        [2] => 2 //Parent ID
    )
[4] => Array
    (
        [0] => 3 //ID
        [1] => TEST //Name
        [2] => 3 //Parent ID
    )
)

Answer 1

您可以使用array_multisort ()。

//get lists to sort by
foreach ($your_array as $key => $value) {

    $id_array[$key]        = $value[0];
    $parent_id_array[$key] = $value[2];

}

//sort first by `id` ascending, then by `parent_id` ascending
array_multisort ($id_array, SORT_ASC, $parent_id_array, SORT_ASC, $your_array);

你甚至可以使用array_orderby ()来缩短上面的例子：

$your_array = array_orderby ($your_array, 0, SORT_ASC, 2, SORT_ASC);

Answer 2

使用此代码。它会工作

foreach ($data as $key => $row) {
    $id[$key] = $row[0];
    $parent_id[$key] = $row[2];
}

array_multisort($id,SORT_ASC,$parent_id,SORT_ASC,$data);