如何按PHP中给定键的值对关联数组的数组进行排序? [英] How to sort an array of associative arrays by value of a given key in PHP?

问题描述

给定这个数组:

$inventory = array(

   array("type"=>"fruit", "price"=>3.50),
   array("type"=>"milk", "price"=>2.90),
   array("type"=>"pork", "price"=>5.43),

);

我想按价格对 $inventory 的元素进行排序以获得:

I would like to sort $inventory's elements by price to get:

$inventory = array(

   array("type"=>"pork", "price"=>5.43),
   array("type"=>"fruit", "price"=>3.50),
   array("type"=>"milk", "price"=>2.90),

);

我该怎么做?

推荐答案

你说得对，你要找的函数是 array_multisort().

You are right, the function you're looking for is array_multisort().

这是直接取自手册并适合您的情况的示例:

Here's an example taken straight from the manual and adapted to your case:

$price = array();
foreach ($inventory as $key => $row)
{
    $price[$key] = $row['price'];
}
array_multisort($price, SORT_DESC, $inventory);

从 PHP 5.5.0 开始，您可以使用 array_column() 而不是 foreach:

As of PHP 5.5.0 you can use array_column() instead of that foreach:

$price = array_column($inventory, 'price');

array_multisort($price, SORT_DESC, $inventory);

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