多維數組排序

Question

這裏是一種情況：

蒂姆，羅布和吉姆住在一起。吉姆有一把吉他，他賣給了蒂姆。吉姆用這筆錢買了一雙新的時髦鞋。 Rob意外地摔壞了Tim的吉他（他從Tim那裏買來的），此後，Rob向Tim發出一聲玩具吉他的鼓勵，Tim用它來休息。

這裏是在房間裏完成的一系列活動，最新活動第一。

$all_users_activities = array( 
    case1 => array(username =>'Tim', activity => 'broken', object_type => 'toy', objectname=> 'Guitar'), 
    case2 => array(username =>'Rob', activity => 'gifted', object_type => 'toy', objectname=> 'Guitar'), 
    case3 => array(username =>'Rob', activity => 'broken', object_type => 'music', objectname=> 'Guitar'), 
    case4 => array(username =>'Tim', activity => 'bought', object_type => 'music', objectname=> 'Guitar'), 
    case5 => array(username =>'Jim', activity => 'bought', object_type => 'fashion', objectname=> 'shoes'), 
    case6 => array(username =>'Jim', activity => 'sold', object_type => 'music', objectname=> 'Guitar') 
    ); 

現在，我要根據排序這樣的數據：

1. 用戶名
2. 對象名（其中 'OBJECT_TYPE' 是一樣的： 'toy''guitar' 是'音樂」不同吉他'）
3. 活動

Answer 1

檢查了這一點

function aasort (&$array, $key) { 
    $sorter=array(); 
    $ret=array(); 
    reset($array); 
    foreach ($array as $ii => $va) { 
     $sorter[$ii]=$va[$key]; 
    } 
    asort($sorter); 
    foreach ($sorter as $ii => $va) { 
     $ret[$ii]=$array[$ii]; 
    } 
    $array=$ret; 
    echo "<pre>"; 
    print_r($array); 
} 
$all_users_activities=array( 
    case1 => array('username' =>'Tim', activity => 'broken', object_type => 'toy', objectname=> 'Guitar'), 
    case2 => array('username' =>'Rob', activity => 'gifted', object_type => 'toy', objectname=> 'Guitar'), 
    case3 => array('username' =>'Rob', activity => 'broken', object_type => 'music', objectname=> 'Guitar'), 
    case4 => array('username' =>'Tim', activity => 'bought', object_type => 'music', objectname=> 'Guitar'), 
    case5 => array('username' =>'Jim', activity => 'bought', object_type => 'fashion', objectname=> 'shoes'), 
    case6 => array('username' =>'Jim', activity => 'sold', object_type => 'music', objectname=> 'Guitar') 
    ); 
aasort($all_users_activities,"username");