如何按 PHP 中内部数组的字段之一对多维数组进行排序? [英] How do I sort a multidimensional array by one of the fields of the inner array in PHP?

问题描述

假设我有一个模拟数据库表的数组.每个数组元素代表一行，每行内是另一个包含字段名称和值的数组.

Suppose I have an array that mimics a database table. Each array element represents 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
        )  
}

我想做的是按价格对行(外部数组元素)进行排序.以下是我想要实现的示例:

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
        )        
}

如您所见，我不需要保留外部数组的键.

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，一个通过用户定义的函数对数组进行排序的函数.类似的东西:

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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