通过键排序PHP中的数组 [英] Sorting an array in PHP by key

问题描述

下面是我的阵列，我们称之为 $改编

 阵列（[0] =＆GT;数组（[文章] =＆GT; 159 [城市] =＆GT;丹佛[国家] =＆GT; [状态] =＆GT;科罗拉多州）
        [1] =＆GT;阵列（[文章] =＆GT; 165 [城市] =＆GT;迈阿密[国家] =＆GT;美国[状态] =＆GT;佛罗里达州）
        [2] =＆GT;阵列（[文章] =＆GT; 172 [城市] =＆GT;东卢瑟福[国家] =＆GT;美国[状态] =＆GT;新泽西州））
 

我想这个排序由数组以升序键城市这样的阵列将是：

 阵列（[0] =＆GT;数组（[文章] =＆GT; 159 [城市] =＆GT;丹佛[国家] =＆GT; [状态] =＆GT;科罗拉多州）
        [2] =＆GT;阵列（[文章] =＆GT; 172 [城市] =＆GT;东卢瑟福[国家] =＆GT;美国[状态] =＆GT;新泽西州）
        [1] =＆GT;阵列（[文章] =＆GT; 165 [城市] =＆GT;迈阿密[国家] =＆GT;美国[状态] =＆GT;佛罗里达州））
 

然后我要由国家键值按升序排列数组排序也因此它看起来就像这样：

 阵列（[0] =＆GT;数组（[文章] =＆GT; 159 [城市] =＆GT;丹佛[国家] =＆GT; [状态] =＆GT;科罗拉多州）
        [1] =＆GT;阵列（[文章] =＆GT; 165 [城市] =＆GT;迈阿密[国家] =＆GT;美国[状态] =＆GT;佛罗里达州
        [2] =＆GT;阵列（[文章] =＆GT; 172 [城市] =＆GT;东卢瑟福[国家] =＆GT;美国[状态] =＆GT;新泽西州））
 

解决方案

您需要用一个回调使用usort。

  usort（$阵列功能（$ A，$ B）{
    回报（STRCMP（$ A ['城市']，$ B ['城市']））;
}）;
 

匿名函数只因为PHP 5.3工作，所以如果你使用的东西，旧的移动回调到一个新的功能：

 函数my_array_sort_callback（$ A，$ B）{
    回报（STRCMP（$ A ['城市']，$ B ['城市']））
}usort（$阵列my_array_sort_callback）;
 

Here is my array, let's call it $arr

Array ( [0] => Array ( [post] => 159 [city] => Denver [country] => [state] => Colorado) 
        [1] => Array ( [post] => 165 [city] => Miami [country] => United States [state] => Florida ) 
        [2] => Array ( [post] => 172 [city] => East Rutherford [country] => United States [state] => New Jersey ) )

I would like to sort this array by the key "city" in ascending order so the array will be:

Array ( [0] => Array ( [post] => 159 [city] => Denver [country] => [state] => Colorado) 
        [2] => Array ( [post] => 172 [city] => East Rutherford [country] => United States [state] => New Jersey )
        [1] => Array ( [post] => 165 [city] => Miami [country] => United States [state] => Florida ) )

I then want to also sort the array by the state key values in ascending order so it will look like this:

Array ( [0] => Array ( [post] => 159 [city] => Denver [country] => [state] => Colorado)
        [1] => Array ( [post] => 165 [city] => Miami [country] => United States [state] => Florida
        [2] => Array ( [post] => 172 [city] => East Rutherford [country] => United States [state] => New Jersey ) )

解决方案

You need to use usort with a callback.

usort ($array, function ($a, $b) {
    return (strcmp ($a ['city'], $b ['city']));
});

anonymous functions only work since php 5.3 so in case you use something older move the callback to a new function:

function my_array_sort_callback($a, $b) {
    return (strcmp ($a ['city'], $b ['city']))
}

usort ($array, "my_array_sort_callback");

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