2

我正在尝试做的是采用具有相同类型结果的 2 个（当前，但最终将是 4 个）数组，将它们放在一起，按它们的值之一（post_time）对它们进行排序，并将它们回显到按该排序顺序显示屏幕。

我可以通过 while 循环通过它们各自的结果/数组来回显这些结果，但它们不会按总的发布时间正确排序，只能在它们各自的数组中。

我对嵌套的 foreach 循环感到困惑。我已经在我拥有的两个数组上尝试了 array_merge，然后将该数组放入另一个数组中，只是为了有一个数字键可以循环，但我被卡住了，感到困惑和疲倦。我已经完成了研究，但我无法将我看到的答案与我自己的特定代码进行比较。

我需要帮助。这就是我所拥有的。这是从数据库中检索单独的信息集/数组的代码。

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>';
    }
}

哪个输出：

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，显然我得到的键也是来自内部 foreach 循环的字符串。它们来自第二个“building_logs”查询。我没想到我从上面快速记下的循环嵌套中得到的输出正是我想要的，但我会说我不知道​​为什么会这样。

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，拜托。我将非常感激，因为即使我已经编写了一年多的代码，除了 while 循环之外，我几乎不需要处理任何循环，而且我使用的数组从来都不是多维的。

4

1 回答 1

0

$row = mysql_fetch_array($result)包含 DB 中的每个值两次，
(1) 作为数值数组和
(2) 作为关联数组：

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

尝试... mysql_fetch_array($result,MYSQL_NUM)仅获取数字索引，或仅
.. MYSQL_ASSOC)获取关联索引。

array_merge...
“如果输入数组具有相同的字符串键，则该键的后一个值将覆盖前一个。但是，如果数组包含数字键，则后一个值不会覆盖原始值，而是附加。”
引自http://www.php.net/manual/en/function.array-merge.php

我想这解释了你得到的奇怪结果。

因此，首先设置mysql_get_array($result,MYSQL_NUM)，然后将数组合并到$list，然后对它们进行排序（参见 php.net），然后回显它们。

$messages = array($list);不过，对我来说没有多大意义。

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，我忘了提到 mysql_* 已弃用，请移至 mysqli 或 PDO。

于 2013-03-03T01:26:47.803 回答