PHP开发小技巧②—实现二维数组根据key进行排序

        在PHP中内置了很多对数组进行处理的函数，有很多时候我们直接使用其内置函数就能达到我们的需求，得到我们所想要的结果；但是，有的时候我们却不能通过使用内置函数实现我们的要求，这就需要我们自己去编写算法来对自己的想法进行实现。下面就讲述一下如何实现二维数组根据key进行排序。

        实现方法：

    <?php
    
    /**
     * =======================================
     * Created by Zhihua_W.
     * Author: Zhihua_W
     * Date: 2016/11/26 0002
     * Time: 下午 2:43
     * Project: PHP开发小技巧
     * Power: 实现二维数组根据key进行排序
     * =======================================
     */
    
    /**
     * 二维数组排序
     * @param array $arr 需要排序的二维数组
     * @param string $keys 所根据排序的key
     * @param string $type 排序类型，desc、asc
     * @return array $new_array 排好序的结果
     */
    function array_sort($arr, $keys, $type = "desc")
    {
        $key_value = $new_array = array();
        foreach ($arr as $k => $v) {
            $key_value[$k] = $v[$keys];
        }
        if ($type == "asc") {
            asort($key_value);
        } else {
            arsort($key_value);
        }
        reset($key_value);
        foreach ($key_value as $k => $v) {
            $new_array[$k] = $arr[$k];
        }
        return $new_array;
    }
    
    $arr = array(
        array(
            "name" => "a",
            "sex" => "m",
            "sort" => 5
        ),
        array(
            "name" => "c",
            "sex" => "m",
            "sort" => 8
        ),
        array(
            "name" => "g",
            "sex" => "m",
            "sort" => 3
        ),
        array(
            "name" => "e",
            "sex" => "w",
            "sort" => 6
        ),
        array(
            "name" => "b",
            "sex" => "w",
            "sort" => 2
        ),
    );
    
    //打印出原数组
    print_r($arr);
    //打印出排好序的数组
    print_r(array_sort($arr,"name"));
    
    ?>

        通过打印出的结果我们就可以看到，数组根据“name”进行排序。

//原数组
Array
(
    [0] => Array
        (
            [name] => a
            [sex] => m
            [sort] => 5
        )

    [1] => Array
        (
            [name] => c
            [sex] => m
            [sort] => 8
        )

    [2] => Array
        (
            [name] => g
            [sex] => m
            [sort] => 3
        )

    [3] => Array
        (
            [name] => e
            [sex] => w
            [sort] => 6
        )

    [4] => Array
        (
            [name] => b
            [sex] => w
            [sort] => 2
        )

)
//排序后数组
Array
(
    [2] => Array
        (
            [name] => g
            [sex] => m
            [sort] => 3
        )

    [3] => Array
        (
            [name] => e
            [sex] => w
            [sort] => 6
        )

    [1] => Array
        (
            [name] => c
            [sex] => m
            [sort] => 8
        )

    [4] => Array
        (
            [name] => b
            [sex] => w
            [sort] => 2
        )

    [0] => Array
        (
            [name] => a
            [sex] => m
            [sort] => 5
        )

)