<?php
$data = array(
    1001 => array(
        'age' => 22,
        'name' => '鸠摩智'
    ),
    1007 => array(
        'age' => 21,
        'name' => '慕容复'
    ),
    1004 => array(
        'age' => 27,
        'name' => '乔帮主'
    )
);
//根据字段age对数组$data进行升序排列 

$ages = array_column($data, 'age'); 

array_multisort($ages, SORT_ASC, $data); 

print_r($data);