本文原发布于 2022-07-04，从旧博客迁移至此处。 整理：Hermes
在开发过程中，经常需要对多维数组按照多个字段进行排序。本文将介绍一种实用的多字段排序方法。
asc（升序）和 desc（降序）array_multisort() 实现多字段排序整理：Hermes
<?php
if (!function_exists('sortByTwoField')) {
/**
* 数组按照两个字段排序
* @param array $data 传入数组
* @param string $field1 首要字段+空格+排序方法 例：field1 desc 默认 DESC
* @param string $field2 次要字段+空格+排序方法 例：field2 asc 默认 DESC
* @return array|string 排序好的数组
*/
function sortByTwoField($data, $field1 = '', $field2 = '')
{
if(!is_array($data)) return '请传入数组';
if (count($data) <= 0 || empty($field1) || empty($field2)) return $data;
$sort1 = SORT_DESC;
$sort2 = SORT_DESC;
$f1 = explode(" ", $field1);
$field1 = $f1[0];
if (isset($f1[1])) {
if (strtolower($f1[1]) == 'asc') $sort1 = SORT_ASC;
}
$f2 = explode(" ", $field2);
$field2 = $f2[0];
if (isset($f2[1])) {
if (strtolower($f2[1]) == 'asc') $sort2 = SORT_ASC;
}
foreach ($data as $key => $value) {
if (!isset($value[$field1])) return ["字段'{$field1}'不存在"];
if (!isset($value[$field2])) return ["字段'{$field2}'不存在"];
$price[$key] = $value[$field1];
$num[$key] = $value[$field2];
}
array_multisort($price, $sort1, $num, $sort2, $data);
return $data;
}
}
?><?php
$phb = array(
['id'=>1, 'daka_day60'=>'1', 'likes'=>'8'],
['id'=>2, 'daka_day60'=>'8', 'likes'=>'1'],
['id'=>3, 'daka_day60'=>'5', 'likes'=>'2'],
['id'=>4, 'daka_day60'=>'5', 'likes'=>'7'],
['id'=>5, 'daka_day60'=>'5', 'likes'=>'5'],
);
// 按 daka_day60 降序，相同时按 likes 升序
$phb = sortByTwoField($phb, 'daka_day60', 'likes asc');
print_r($phb);
?>[
{"id": 2, "daka_day60": "8", "likes": "1"},
{"id": 3, "daka_day60": "5", "likes": "2"},
{"id": 5, "daka_day60": "5", "likes": "5"},
{"id": 4, "daka_day60": "5", "likes": "7"},
{"id": 1, "daka_day60": "1", "likes": "8"}
]