获取 PHP 数组中的最小值和最大值 [英] Get min and max value in PHP Array

问题描述

我有一个这样的数组:

<前><代码>数组 (0 =>大批 ('id' => '20110209172713','日期' => '2011-02-09','重量' => '200',),1 =>大批 ('id' => '20110209172747','日期' => '2011-02-09','重量' => '180',),2 =>大批 ('id' => '20110209172827','日期' => '2011-02-09','重量' => '175',),3 =>大批 ('id' => '20110211204433','日期' => '2011-02-11','重量' => '195',),)

我需要提取最小和最大权重值.在这个例子中

$min_value = 175

$max_value = 200

有关如何执行此操作的任何帮助?谢谢！

解决方案

选项 1. 首先映射数组以获取这些数字(而不是完整的详细信息):

$numbers = array_column($array, 'weight')

然后你得到最小值和最大值:

$min = min($numbers);$max = max($numbers);

选项 2.(仅当您没有 PHP 5.5 或更高版本时)与选项 1 相同，但要提取值，请使用 array_map:

$numbers = array_map(function($details) {返回 $details['Weight'];}, $array);

选项 3.

选项 4.如果您只需要最小值或最大值，array_reduce() 可能会更快:

$min = array_reduce($array, function($min, $details) {return min($min, $details['weight']);}, PHP_INT_MAX);

这会执行更多 min()，但它们非常快.PHP_INT_MAX 就是从高开始，然后越来越低.你可以对 $max 做同样的事情，但你会从 0 或 -PHP_INT_MAX 开始.

I have an array like this:

array (0 => 
  array (
    'id' => '20110209172713',
    'Date' => '2011-02-09',
    'Weight' => '200',
  ),
  1 => 
  array (
    'id' => '20110209172747',
    'Date' => '2011-02-09',
    'Weight' => '180',
  ),
  2 => 
  array (
    'id' => '20110209172827',
    'Date' => '2011-02-09',
    'Weight' => '175',
  ),
  3 => 
  array (
    'id' => '20110211204433',
    'Date' => '2011-02-11',
    'Weight' => '195',
  ),
)

I need to extract minimal and maximal Weight values. In this example

$min_value = 175

$max_value = 200

Any help on how to do this ? Thank you !

解决方案

Option 1. First you map the array to get those numbers (and not the full details):

$numbers = array_column($array, 'weight')

Then you get the min and max:

$min = min($numbers);
$max = max($numbers);

Option 2. (Only if you don't have PHP 5.5 or better) The same as option 1, but to pluck the values, use array_map:

$numbers = array_map(function($details) {
  return $details['Weight'];
}, $array);

Option 3.

Option 4. If you only need a min OR max, array_reduce() might be faster:

$min = array_reduce($array, function($min, $details) {
  return min($min, $details['weight']);
}, PHP_INT_MAX);

This does more min()s, but they're very fast. The PHP_INT_MAX is to start with a high, and get lower and lower. You could do the same for $max, but you'd start at 0, or -PHP_INT_MAX.

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