二维数组根据某一个字段排序

二维数组，都有一个年龄的值，按照年龄倒序排序
也可以是两个不同的二维数组，但只要age字段保持一致就可以排序

header('Content-Type:text/html;Charset=utf-8');
$arrUsers = array(
    array(
            'id'   => 1,
            'name' => '张三',
            'age'  => 25,
    ),
    array(
            'id'   => 2,
            'name' => '李四',
            'age'  => 23,
    ),
    array(
            'id'   => 3,
            'name' => '王五',
            'age'  => 40,
    ),
    array(
            'id'   => 4,
            'name' => '赵六',
            'age'  => 31,
    ),
    array(
            'id'   => 5,
            'name' => '黄七',
            'age'  => 20,
    ),
); 
 
 
$sort = array(
        'direction' => 'SORT_DESC', //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
        'field'     => 'age',       //排序字段
);
$arrSort = array();
foreach($arrUsers AS $uniqid => $row){
    foreach($row AS $key=>$value){
        $arrSort[$key][$uniqid] = $value;
    }
}
if($sort['direction']){
    array_multisort($arrSort[$sort['field']], constant($sort['direction']), $arrUsers);
}
 
var_dump($arrUsers);