abstrak：<?php/**// * Created by PhpStorm.// * User: hp// * Date: 2019/3/29// * Time: 11:17// */echo '<pre>';$arr = [ ['name'=>'jesse','day'=>527,'age'=&g

<?php
/**
// * Created by PhpStorm.
// * User: hp
// * Date: 2019/3/29
// * Time: 11:17
// */
echo '<pre>';
$arr = [
['name'=>'jesse','day'=>527,'age'=>10],
['name'=>'clancy','day'=>814,'age'=>17],
['name'=>'kiwi','day'=>612,'age'=>21]
];
echo '排序前'.var_export($arr,true),'<hr>';

usort($arr,function($a,$b)
{
//    return strcmp($a['day'],$b['day']);
   return strcmp($a['age'],$b['age']);
});
echo '排序之后:',var_export($arr,true),'<hr>';

Guru membetulkan：天蓬老師Masa pembetulan：2019-03-29 14:13:41
Rumusan guru：原生php沒有提供多維數(shù)組排序功能的函數(shù), 不過, 提供了一個接口函數(shù)usort()供用戶自己擴展