使用公用键对数组内的数组进行排序

Question

我有这个数组的数组，

Array
(
[0] => Array
    (
        [id] => 1
        [title] => AP-2 (1)
    )

[1] => Array
    (
        [id] => 2
        [title] => AC-1 (2)
    )

[2] => Array
    (
        [id] => 3
        [title] => AB-3 (1)
    )

[3] => Array
    (
        [id] => 4
        [title] => AD-2 (3)
    )

[4] => Array
    (
        [id] => 5
        [title] => AE-2 (1)
    )

),

我需要对它进行排序，它看起来像这样，

Array
(
[0] => Array
    (
        [id] => 1
        [title] => AB-3 (1)
    )

[1] => Array
    (
        [id] => 2
        [title] => AC-1 (2)
    )

[2] => Array
    (
        [id] => 3
        [title] => AD-2 (3)
    )

[3] => Array
    (
        [id] => 4
        [title] => AE-2 (1)
    )

[4] => Array
    (
        [id] => 5
        [title] => AP-2 (1)
    )

)

这里发生的基本上是，使用title键按字母顺序对数组进行排序，或者可能使用natsort()或natcasesort()对其进行排序。我到底该如何进行排序呢？提前谢谢。

Answer 1

function sorter($key){
    return function ($a, $b) use ($key) {
        return strcmp($a[$key], $b[$key]);
    };
}
usort($arr, sorter('title'));
var_dump($arr);

对于早于5.3的PHP版本，请使用：

function sorter($arr, $index) {
    foreach($arr as $key => $value) {
        $arr2[$key] = strtolower($value[$index]);
    }
    asort($arr2);
    foreach($arr2 as $key =>$value) {
        $arr3[] = $arr[$key];
    }
    return $arr3;
}
var_dump(sorter($arr, 'title'));