3

我有一个从 eventbrite.com api 返回的数据数组,存储在一个名为 $restrictedEvents 的变量中,它看起来像下面的数据。这仅代表一个事件,以便在此处粘贴,但它在整个数组中有大约 80 个这样的 stdClass 对象。

我想通过每个 stdClass 对象中的 [title] 键按字母顺序对该数组进行排序。我试过使用:

usort($restrictedEvents, "title");

但是,这会返回以下错误:

Warning: usort() [function.usort]: Invalid comparison function in model.php on line 109

我的猜测是它找不到标题键,因为它位于下一层。任何关于我哪里出错以及如何按标题排序的指示将不胜感激。非常感谢。

Array 
(
[4791063199] => stdClass Object
    (
        [box_header_text_color] => 393837
        [link_color] => EE6600
        [box_background_color] => FFFFFF
        [box_border_color] => D9D4D0
        [timezone] => Europe/London
        [organizer] => stdClass Object
            (
                [url] => http://www.eventbrite.com/org/2866607767
                [description] => 
                [long_description] => 
                [id] => 2866607767
                [name] => B&Q Manifestival
            )

        [background_color] => E3DFDC
        [id] => 4791063199
        [category] => 
        [box_header_background_color] => F0ECE9
        [capacity] => 20
        [num_attendee_rows] => 0
        [title] => Closed Event Test
        [start_date] => 2012-11-07 19:00:00
        [status] => Live
        [description] => Lorem ipsum
        [end_date] => 2012-11-07 21:00:00
        [tags] => 
        [timezone_offset] => GMT+0000
        [text_color] => 393837
        [title_text_color] => 
        [password] => 
        [tickets] => Array
            (
                [0] => stdClass Object
                    (
                        [ticket] => stdClass Object
                            (
                                [description] => 
                                [end_date] => 2012-11-07 17:00:00
                                [min] => 1
                                [max] => 1
                                [price] => 0.00
                                [quantity_sold] => 0
                                [visible] => true
                                [currency] => GBP
                                [quantity_available] => 20
                                [type] => 0
                                [id] => 15940001
                                [name] => Manifestival Event
                            )

                    )

            )

        [created] => 2012-11-07 10:40:36
        [url] => http://www.eventbrite.com/event/4791063199
        [box_text_color] => 393837
        [privacy] => Private
        [venue] => stdClass Object
            (
                [city] => 
                [name] => HR Training Room
                [country] => 
                [region] => 
                [longitude] => 0
                [postal_code] => 
                [address_2] => 
                [address] => 
                [latitude] => 0
                [country_code] => 
                [id] => 2619469
                [Lat-Long] => 0.0 / 0.0
            )

        [modified] => 2012-11-07 10:47:20
        [repeats] => no
    )
4

4 回答 4

10

第二个参数usort应该是一个函数。请参阅http://php.net/manual/en/function.usort.php。您需要向它传递一个函数,例如:

function cmp($a, $b)
{
    return strcmp($a->title, $b->title);
}

我想你会这样称呼它usort($restrictedEvents, "cmp");

于 2012-11-07T20:14:11.893 回答
3

你可以用茴香酒来做:

$result = Arrays::sort($restrictedEvents, Comparator::compareBy('title'));

http://ouzo.readthedocs.org/en/latest/utils/comparators.html

于 2015-01-07T16:00:17.703 回答
1

to的第二个参数usort是一个函数,而不是键名。该函数传递了正在排序的数组的两个元素并返回一个值,该值指示这两个元素应如何相对于彼此进行排序:-1 如果它们传递给函数的顺序是正确的,如果是相反的,则为 1 , 如果无关紧要则为 0(就比较而言,这两个元素相等)。这是您的案例的示例:

usort($restrictedEvents, 
      function($a, $b) { return strcmp($a->title, $b->title); });

如果您使用的是较旧的 PHP(在 5.3.0 之前,它引入了匿名函数),那么您必须为比较函数命名并将该名称作为字符串传递给usort

function titlecmp($a, $b) {
  return strcmp($a->title, $b->title); 
}
usort($restrictedEvents, "titlecmp");
于 2012-11-07T20:18:31.890 回答
-1

通常这样的事情是通过第二个数组来实现的$keyToSort => $id,通过标准排序函数或你自己的排序这个数组,然后你有一个转换为你的第一个数组

使用它,您的阵列的深度是无限的。

于 2012-11-07T20:13:03.237 回答