如何通过每一个对象的属性来排序对象的数组 [英] How to sort an array of objects by a property of each object
问题描述
我有一个从存储在一个变量的eventbrite.com API返回的数据数组名为$ restrictedEvents它看起来像下面的数据。这是粘贴在这里的目的只有一个事件的再次presentative但它有一个约80 stdClass的对象像这样完整的数组
我想这个数组在每个stdClass的对象的[标题]键按字母顺序排序。我已经尝试使用：
usort（$ restrictedEvents，称号）;
然而，这将返回以下错误：
警告：usort（）[function.usort]：在model.php无效的比较功能上线109
我的猜测是它无法找到标题关键，因为这是一个新的水平下降。在我要去的地方错了，我怎么可以按标题将大大AP preciated任何指针。非常感谢。
阵列
（
[4791063199] =＆GT; stdClass的对象
（
[box_header_text_color] =＆GT; 393837
[link_color] =＆GT; EE6600
[box_background_color] =＆GT; FFFFFF
[box_border_color] =＆GT; D9D4D0
[时区] =＆GT;欧洲/伦敦
[主办] =＆GT; stdClass的对象
（
[URL] =＆GT; http://www.eventbrite.com/org/2866607767
[说明] =＆GT;
[LONG_DESCRIPTION] =＆GT;
[ID] =＆GT; 2866607767
[名] =＆GT; B＆安培;问Manifestival
） [BACKGROUND_COLOR] =＆GT; E3DFDC
[ID] =＆GT; 4791063199
【类别】= GT;
[box_header_background_color] =＆GT; F0ECE9
[容量] =＆GT; 20
[num_attendee_rows] =＆GT; 0
[标题] =＆GT;封闭测试活动
[起始日期] =＆GT; 2012-11-07 19:00:00
[现状] =＆GT;生活
[说明] =＆GT; Lorem存有
[END_DATE] =＆GT; 2012-11-07 21:00:00
[标签] =＆GT;
[了timezone_offset] =＆GT; GMT + 0000
[text_color] =＆GT; 393837
[title_text_color] =＆GT;
[密码] =＆GT;
[机票] =＆GT;排列
（
[0] =＆GT; stdClass的对象
（
[票] =＆GT; stdClass的对象
（
[说明] =＆GT;
[END_DATE] =＆GT; 2012-11-07 17:00:00
[分钟] =＆GT; 1
[MAX] =＆GT; 1
[价格] =＆GT; 0.00
[quantity_sold] =＆GT; 0
[可见] =＆GT;真正
[外汇] =＆GT;英镑
[quantity_available] =＆GT; 20
[类型] = GT; 0
[ID] =＆GT; 15940001
[名] =＆GT; Manifestival事件
） ） ） [创建] =＆GT; 2012-11-07十时40分36秒
[URL] =＆GT; http://www.eventbrite.com/event/4791063199
[box_text_color] =＆GT; 393837
[隐私] =＆GT;私人的
[地点] =＆GT; stdClass的对象
（
[城市] =＆GT;
[名] =＆GT; HR培训室
[国家] =＆GT;
[区域] =＆GT;
[经度] =＆GT; 0
[postal_ code =＆GT;
[address_2] =＆GT;
[地址] =＆GT;
[纬度] =＆GT; 0
[country_ code =＆GT;
[ID] =＆GT; 2619469
[纬度龙] =＆GT; 0.0 / 0.0
） [修改] =＆GT; 2012-11-07 10点47分20秒
[重复] =＆GT;没有
）
第二paramater到 usort 应该是一个功能。请参见 http://php.net/manual/en/function.usort.php 。你需要传递一个功能，如：
函数CMP（$ A，$ B）
{
返回STRCMP（$ A-＆GT;标题，$ B-＆GT;标题）;
}
我觉得您需要调用它像 usort（$ restrictedEvents，CMP）;
I have an array of data returned from the eventbrite.com api stored in a variable called $restrictedEvents which looks like the data below. This is representative of just one event for the purposes of pasting here but it has a about 80 stdClass Objects like this in the full array.
I want to sort this array alphabetically by the [title] key in each stdClass Object. I have tried using:
usort($restrictedEvents, "title");
However this returns the following error:
Warning: usort() [function.usort]: Invalid comparison function in model.php on line 109
My guess is it cannot find the title key as this is in the next level down. Any pointers on where I am going wrong and how I can sort by the title would be greatly appreciated. Many thanks.
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
)
The second paramater to usort should be a function. See http://php.net/manual/en/function.usort.php. You would need to pass it a function like:
function cmp($a, $b)
{
return strcmp($a->title, $b->title);
}
I think you would then call it like usort($restrictedEvents, "cmp");.
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