Question

我今天有一个相当困难的问题而且我不知道是否可以这样做，但是如果是的话它会帮助我。这是我的代码：

$chatquery = mysql_query("SELECT * FROM conversation 
                          WHERE yourusername='$username' AND 
                          theirusername='$otherchatuser' 
                          ORDER BY ID DESC");

while ($runrows = mysql_fetch_assoc($chatquery))
{
    $chatname = $runrows['realuserusername'];
    $chatmessage = nl2br($runrows['message']);
    $chatmessage = preg_replace('/(((f|ht){1}tp:\/\/)[-a-zA-Z0-9@:%_\+.~#?&\/\/=]+)/i',
                                '<a href="\\1" style="color:#36648B;" target="_blank">\\1</a>', 
                                $chatmessage);

    $chatmessage = preg_replace('/([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_\+.~#?&\/\/=]+)/i',
                                '\\1<a href="http://\\2" style="color:#36648B;" target="_blank">\\2</a>', 
                                $chatmessage);

    $chatlocation = $runrows['imagelocation'];
    $chatimage = "<img src='$chatlocation' style='width:25px; height:20px;' />";

    echo '<table style="margin-bottom:5px;">
            <tr>
                <td valign="top" style="padding-right:5px;">'.$chatimage.'</td>
                <td><div style="max-width:220px; word-wrap:break-word;">'.$chatmessage.'<div></td>
            </tr>
          </table>';
}

这是一个聊天插件，现在所有消息都以DESC顺序显示，这就是我想要的。但是，我想要做的是，如果我的查询连续多次获得相同的用户$chatname，我希望它以ASC顺序显示这些消息而不显示{{1再次。然后，一旦获得不同的$chatname，它就会继续按$chatname顺序排列。所以这就像是颠倒了一个查询。我不知道是否可能，但任何帮助都会受到赞赏。

我的最后一个问题，基于DaveRandom的反应并使用他下面的代码。在重复用户名的地方，我想要代码

DESC

如果没有，我想拥有

$usermessage = '<table><tr><td valign="top" style="padding-right:5px;"></td><td><div style="max-width:220px; word-wrap:break-word;">'.$chatmessage.'<div></td></tr></table>';

我将如何做到这一点？

Answer 1

我认为为了做到这一点，你必须循环数据两次，一次建立订单，一次输出信息。例如：

function make_row_output ($row, $isRepeated = FALSE) {
  $chatname = $row['realuserusername'];
  $chatmessage = preg_replace(
    array(
      '/(((f|ht){1}tp:\/\/)[-a-zA-Z0-9@:%_\+.~#?&\/\/=]+)/i',
      '/([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_\+.~#?&\/\/=]+)/i'
    ),
    array(
      '<a href="\\1" style="color:#36648B;" target="_blank">\\1</a>',
      '\\1<a href="http://\\2" style="color:#36648B;" target="_blank">\\2</a>'
    ),
    nl2br($row['message'])
  );
  $chatlocation = $row['imagelocation'];
  $chatimage = "<img src='$chatlocation' style='width:25px; height:20px;' />";
  return ($isRepeated)
    ? '<table><tr><td valign="top" style="padding-right:5px;"></td><td><div style="max-width:220px; word-wrap:break-word;">'.$chatmessage.'<div></td></tr></table>'
    : '<table style="margin-bottom:5px;"><tr><td valign="top" style="padding-right:5px;">'.$chatimage.'</td><td><div style="max-width:220px; word-wrap:break-word;">'.$chatmessage.'<div></td></tr></table>';
}

// Do the query
$query = "SELECT *
          FROM conversation
          WHERE yourusername = '$username'
          AND theirusername = '$otherchatuser'
          ORDER BY ID DESC"
$result = mysql_query($query);

// Loop the data and build an ordered array
$last = FALSE;
$rows = $userRows = array();
while ($row = mysql_fetch_assoc($result)) {
  if ($last !== FALSE && $row['realuserusername'] != $last) {
    $userRows = array_reverse($userRows);
    echo make_row_output(array_shift($userRows));
    foreach ($userRows as $row2) {
      echo make_row_output($row2, TRUE);
    }
    $userRows = array($row);
  } else {
    $userRows[] = $row;
  }
  $last = $row['realuserusername'];
}

// Last loop to catch any entries still in $userrows
$userRows = array_reverse($userRows);
echo make_row_output(array_shift($userRows));
foreach ($userRows as $row2) {
  echo make_row_output($row2, TRUE);
}

不要忘记sanitise your database input！

如何颠倒已经排序的mysql_query的顺序

1 个答案: