PHP development skills (2) - A case of implementing two-dimensional array sorting based on key

There are many built-in functions for processing arrays in PHP. Many times we can meet our needs and get the results we want by directly using their built-in functions; however, sometimes we cannot use The built-in functions implement our requirements, which requires us to write our own algorithms to implement our own ideas. Let's talk about how to sort a two-dimensional array according to key.

Implementation method:

<?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 = &#39;desc&#39;)  
{  
    $key_value = $new_array = array();  
    foreach ($arr as $k => $v) {  
        $key_value[$k] = $v[$keys];  
    }  
    if ($type == &#39;asc&#39;) {  
        asort($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(  
        &#39;name&#39; => &#39;a&#39;,  
        &#39;sex&#39; => &#39;m&#39;,  
        &#39;sort&#39; => 5  
    ),  
    array(  
        &#39;name&#39; => &#39;c&#39;,  
        &#39;sex&#39; => &#39;m&#39;,  
        &#39;sort&#39; => 8  
    ),  
    array(  
        &#39;name&#39; => &#39;g&#39;,  
        &#39;sex&#39; => &#39;m&#39;,  
        &#39;sort&#39; => 3  
    ),  
    array(  
        &#39;name&#39; => &#39;e&#39;,  
        &#39;sex&#39; => &#39;w&#39;,  
        &#39;sort&#39; => 6  
    ),  
    array(  
        &#39;name&#39; => &#39;b&#39;,  
        &#39;sex&#39; => &#39;w&#39;,  
        &#39;sort&#39; => 2  
    ),  
);  
  
//打印出原数组  
print_r($arr);  
//打印出排好序的数组  
print_r(array_sort($arr,&#39;name&#39;));  
  
?>

We can see from the printed results that the array is sorted according to "name".

//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  
        )  
  
)

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