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 = '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'));
?>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
)
)The above is the detailed content of PHP development skills (2) - A case of implementing two-dimensional array sorting based on key. For more information, please follow other related articles on the PHP Chinese website!
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
