我如何排序在PHP内部数组的领域之一多维数组？ [英] How do I sort a multidimensional array by one of the fields of the inner array in PHP?

问题描述

假设我有一个模仿dayabase表的数组。每个数组元素reporesents一个行和每行中是包含的字段名称和值另一个阵列。

Suppose I have an array that mimics a dayabase table. Each array element reporesents a row and within each row is another array that contains the field names and values.

Array
(
    [0] => Array
        (
            [name] => Sony TV
            [price] => 600.00
        )

    [1] => Array
        (
            [name] => LG TV
            [price] => 350.00
        )

    [2] => Array
        (
            [name] => Samsung TV
            [price] => 425.00
        )  
}

我想要做的排序是按价格行（外数组元素）。下面是我想要达到一个例子：

What I want to do is sort the rows (outer array elements) by price. Below is an example of what I want to achieve:

Array
(
    [0] => Array
        (
            [name] => LG TV
            [price] => 350.00
        )

    [1] => Array
        (
            [name] => Samsung TV
            [price] => 425.00
        )

    [2] => Array
        (
            [name] => Sony TV
            [price] => 600.00
        )        
}

正如你可以看到我不需要preserve外阵的钥匙。

As you can see I don't need to preserve the keys of the outer array.

推荐答案

您需要使用 usort ，即通过用户定义的函数数组排序的函数。是这样的：

You need to use usort, a function that sorts arrays via a user defined function. Something like:

function cmp($a, $b)
{
    if ($a["price"] == $b["price"]) {
        return 0;
    }
    return ($a["price"] < $b["price"]) ? -1 : 1;
}

usort($yourArray,"cmp")

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