PHP中的数组排序

Question

我们有一个数组，需要对上面的数组进行排序

Array
(
    [0] => stdClass Object
        (
            [id] => 229
            [firstname] => ggg
            [lastname] => fff
        )

    [1] => stdClass Object
        (
            [id] => 230
            [firstname] => aaa
            [lastname] => jjj
        )

)

我想将数组排序为（按名字排序）

Array
(
    [0] => stdClass Object
        (
            [id] => 230 
            [firstname] => aaa
            [lastname] => jjj

        )

    [1] => stdClass Object
        (
            [id] => 229
            [name] => ggg
            [lastname] => fff
        )

)

Answer 1

使用 usort：

usort($ar, function($a, $b) {
  return strcmp($a->firstname, $b->firstname);
});