Php 从数组返回唯一值

我有一个包含城市的数组，我想返回所有这些城市的数组，但它必须是城市的唯一列表

下面的数组：

Array
(
    [0] => Array
        (
            [eventname] => Wine Tasting
            [date] => 12/20/2013
            [time] => 17:00:00
            [location] => Anaheim Convention Center
            [description] => This is a test description
            [city] => Anaheim
            [state] => California
        )

    [1] => Array
        (
            [eventname] => Circus
            [date] => 12/22/2013
            [time] => 18:30:00
            [location] => LAX
            [description] => Description for LAX event
            [city] => Anaheim
            [state] => California
        )

    [2] => Array
        (
            [eventname] => Blues Fest
            [date] => 3/14/2014
            [time] => 17:00:00
            [location] => Austin Times Center
            [description] => Blues concert
            [city] => Austin
            [state] => Texas
        )

)

应返回：

array('Anaheim', 'Austin');

---

非常感谢您的帮助。

您可以将它们添加为一个键，强制其唯一，然后将其翻转，或者：

foreach($events as $details) {
    $cities[] = $details['city'];
}
$cities = array_unique($cities);

---

使用

array\u map

获取所有城市，然后使用

array\u unique

删除重复项

$cities = array_unique(array_map(function($x) { return $x['city']; }, $array));

---

首先遍历上面数组中的所有条目，并将城市选入临时数组，然后在该临时数组上使用phps

array\u unique

函数。“感谢您的帮助”-也感谢您自己的努力。我删除了我的答案。祝你好运：）

$cities = array_unique(array_map(function($x) { return $x['city']; }, $array));