如何使用foreach循环来检索由两个数组组成的嵌套数组中的信息？

Question

我想要做的是以相同类型的结果作为2（当前，但最终会有4个总数）数组，将它们放在一起，按其值之一对它们进行排序（post_time），并使用echo他们以该排序顺序进入屏幕。

我可以通过它们各自的结果/数组使用while循环来回显这些结果，但是它们不会在发布时间内完全按照它们各自的数组排序。

我在嵌套的foreach循环之间感到困惑。我已经尝试array_merge我有两个数组，然后将该数组放入另一个数组只是有一个数字键循环，但我卡住了，困惑和累了。我已经完成了研究，但我无法将自己的特定代码与我看到的答案进行比较。

我需要一些帮助。这是我得到的。这是从数据库中检索单独的信息集/数组的信息的代码。

include 'db_connect.php'; 
include 'core.php'; 

$get_char = mysql_query("SELECT character_id FROM characters WHERE account_id = '".$_SESSION['user_id']."'"); 
$char = mysql_result($get_char,0,'character_id'); 

$get_location = mysql_query("SELECT current_location, x_cord, y_cord, inside_building FROM characters WHERE character_id = $char"); 
$location = mysql_result($get_location, 0, 'current_location'); 
$x = mysql_result($get_location,0, 'x_cord'); 
$y = mysql_result($get_location,0,'y_cord'); 
$inside = mysql_result($get_location,0,'inside_building'); 

//get all messages where current characters arrival time is less than post_time 
//AND arrival location is the same as posting location 
$get_arrival = mysql_query("SELECT * FROM arrive_exit WHERE character_id = $char ORDER BY arrival DESC"); 
while($arrivals = mysql_fetch_array($get_arrival)){ 
    $arrival = $arrivals['arrival']; 
    $arrival_location = $arrivals['location']; 
    $unix_arrival = strtotime($arrival); 
    $exit = $arrivals['exit']; 
    $unix_exit = strtotime($exit); 
    if(!isset($exit)){ 
    $get_logs = mysql_query("SELECT character_id, log, post_time, event FROM character_logs WHERE UNIX_TIMESTAMP(post_time) >= $unix_arrival 
    AND location = $arrival_location ORDER BY post_time DESC"); 
    }else{ 
    $get_logs = mysql_query("SELECT character_id, log, post_time, event FROM character_logs WHERE UNIX_TIMESTAMP(post_time) >= $unix_arrival 
    AND location = $arrival_location AND UNIX_TIMESTAMP(post_time) <= $unix_exit ORDER BY post_time DESC"); 
    } 
    $o_logs = mysql_fetch_array($get_logs); 

    //CHECK FOR LOGS IN BUILDING LOGS 
    if(!isset($exit)){ 
    $check_logs = mysql_query("SELECT * FROM building_logs WHERE UNIX_TIMESTAMP(post_time) >= $unix_arrival 
    AND current_location = $arrival_location"); 
    }else{ 
    $check_logs = mysql_query("SELECT * FROM building_logs WHERE UNIX_TIMESTAMP(post_time) >= $unix_arrival 
    AND current_location = $arrival_location"); 
    } 
    $building_check = mysql_num_rows($check_logs); 
    if($building_check >= 1){ 
    $get_room = mysql_query("SELECT room_id, building_current_id, building_id FROM building_logs WHERE character_id = $char"); 
    $room_id = mysql_result($get_room,0,'room_id'); 
    $building_current = mysql_result($get_room,0,'building_current_id'); 
    $building_id = mysql_result($get_room,0,'building_id'); 
    if(!isset($exit)){ 
     $get_logs = mysql_query("SELECT character_id, log, post_time, event FROM building_logs WHERE UNIX_TIMESTAMP(post_time) >= $unix_arrival 
     AND current_location = $arrival_location AND x = $x AND y = $y AND room_id = $room_id ORDER BY post_time DESC"); 
    }else{ 
    $get_logs = mysql_query("SELECT character_id, log, post_time, event FROM building_logs WHERE UNIX_TIMESTAMP(post_time) >= $unix_arrival 
    AND current_location = $arrival_location AND x = $x AND y = $y AND room_id = $room_id 
    AND UNIX_TIMESTAMP(post_time) <= $unix_exit ORDER BY post_time DESC"); 
    } 
    $b_logs = mysql_fetch_array($get_logs); 
    } 
} 

这是我试图用来操纵检索结果的非工作代码。

$list = array_merge((array)$o_logs,(array)$b_logs); 
$messages = array($list); 
//echo out info here. 
foreach($messages as $array){ 
    foreach($array as $log_key => $value){ 
    //log_key in this case could be character_id, event, post_time, so on which is not preferable 
    echo $log_key.' : '.$value.'<br>'; 
    } 
} 

，输出：

0 : 62 
character_id : 64 
1 : This is a testing log from a different person at an earlier time in a DIFFERENT location. 
log : This is a log from inside a building now. 
2 : 2013-02-22 04:04:00 
post_time : 2013-02-26 19:00:00 
3 : 0 
event : 0 
4 : 64 
5 : This is a log from inside a building now. 
6 : 2013-02-26 19:00:00 
7 : 0 

所以，很显然我得到这也是从内部foreach循环串钥匙。他们来自第二个“building_logs”查询。我并不期待我在上面的快速循环嵌套中得到我想要的结果，但我会说我不知道​​为什么会发生这种情况。

我需要帮助了解如何嵌套foreach循环以正确获取我需要的信息。我将非常感激，因为即使我已经编写了一年多的代码，但除了while循环之外，我几乎不得不处理任何循环，并且与之一起工作的数组从不是多维的。

Answer 1

$row = mysql_fetch_array($result)包含从DB 两次，
（1）的数值阵列和
（2）作为一个关联数组的每个值：

（1）$row[0]="Hello"和
（2）$row['text']="Hello"

尝试... mysql_fetch_array($result,MYSQL_NUM)仅获得数字指标，或
.. MYSQL_ASSOC)仅获得关联指数。

array_merge ...
“如果输入的数组中有相同的字符串键，则该键的后面的值将覆盖前一个。然而，如果数组包含数字键，后来价值不会覆盖原始值，但会被附加。“
来自http://www.php.net/manual/en/function.array-merge.php的报价

我想这是解释你正在得到的奇怪结果。

因此，首先设置mysql_get_array($result,MYSQL_NUM)，然后合并数组到$list，然后对它们进行排序（请参阅php.net），然后回显它们。但是，对我来说，这并没有多大意义。

做var_dump($list);了解这个数组是如何构建的。然后相应地调整循环。

顺便说一句，我忘了提及mysql_ *已被弃用，转移到mysqli或PDO。