为什么我会返回重复的结果？

Why am I returning duplicate results?

我先说这对我来说是全新的，不管它们是不是高级动作，我只是从其他产品中拼凑出来并适应我的需要。大术语，我不太明白，我知道基础知识，我知道我要实现的目标就是这样哈哈。

所以我已经用这个玩了一段时间了，我已经设法让它工作了，但我现在得到了重复的结果。

这是我的代码：

<?php
$addonid = $db->query_read("
      SELECT drc.threadid AS threadid
      FROM `" . TABLE_PREFIX . "modsys_settings` AS drc
      LEFT JOIN `" . TABLE_PREFIX . "thread` AS thread
      ON(drc.mod_addons=" . $threadinfo['threadid'] . ")
      WHERE thread.threadid IN (" . $threadinfo['threadid'] . ")
    ");
while ($addons = $db->fetch_array($addonid)) {
    $ci_counter = $db->query_read("
          SELECT drc.mod_addons AS addon, drc.threadid, thread.threadid AS threadid, thread.title AS threadtitle
          FROM `" . TABLE_PREFIX . "modsys_settings` AS drc 
          LEFT JOIN `" . TABLE_PREFIX . "thread` AS thread ON(drc.mod_addons=" . $threadinfo['threadid'] . ") 
          WHERE thread.threadid IN (" . $addons['threadid'] . ")
      ");

    while ($counter = $db->fetch_array($ci_counter)) {
        $post['addons'] .= '<li><a href="showthread.php?t=' . $addons['threadid'] . '">' . $counter['threadtitle'] . '</a></li>';
    }
}
?>

这到底是什么乱七八糟的东西！？好吧，这就是我设法开始工作的原因，哈哈，那么它有什么作用呢？简单来说，它在一列中查找 threadid，然后如果它在另一个 table 列中，它会从 table 中获取标题列。然后它使用变量作为值为它们中的每一个创建一个列表link。当它真正起作用时，我感到震惊，这不是我在这里的目的，但可以随意告诉我如何改进它，哈哈。

问题是，它返回所有东西的两倍，所以不是得到

<li><a href="showthread.php?t=4">result</a></li>
<li><a href="showthread.php?t=5">result 2</a></li>

我得到

<li><a href="showthread.php?t=4">result</a></li>
<li><a href="showthread.php?t=4">result</a></li>
<li><a href="showthread.php?t=5">result 2</a></li>
<li><a href="showthread.php?t=5">result 2</a></li>

这是为什么？我能做些什么来解决它？

我已经从循环中删除了查询，但现在它只返回它找到的第一列的重复项（即 4）

<?php
$addonid = $db->query_read("
      SELECT drc.threadid AS threadid
      FROM `" . TABLE_PREFIX . "modsys_settings` AS drc
      LEFT JOIN `" . TABLE_PREFIX . "thread` AS thread
      ON(drc.mod_addons=" . $threadinfo['threadid'] . ")
      WHERE thread.threadid IN (" . $threadinfo['threadid'] . ")
    ");
$addons = $db->fetch_array($addonid);
$ci_counter = $db->query_read("
          SELECT drc.mod_addons AS addon, drc.threadid, thread.threadid AS threadid, thread.title AS threadtitle
          FROM `" . TABLE_PREFIX . "modsys_settings` AS drc 
          LEFT JOIN `" . TABLE_PREFIX . "thread` AS thread ON(drc.mod_addons=" . $threadinfo['threadid'] . ") 
          WHERE thread.threadid IN (" . $addons['threadid'] . ")
      ");

while ($counter = $db->fetch_array($ci_counter)) {
    $post['addons'] .= '<li><a href="showthread.php?t=' . $addons['threadid'] . '">' . $counter['threadtitle'] . '</a></li>';
}
?>

<li><a href="showthread.php?t=4">result</a></li>
<li><a href="showthread.php?t=4">result</a></li>

    $addonid = $db->query_read ("
      SELECT drc.threadid AS threadid
      FROM `" . TABLE_PREFIX . "modsys_settings` AS drc
      LEFT JOIN `" . TABLE_PREFIX . "thread` AS thread
      ON(drc.mod_addons=" . $threadinfo['threadid'] . ")
      WHERE thread.threadid IN (" . $threadinfo['threadid'] . ")
    ");
    while ($addons = $db->fetch_array ($addonid)) {    
        $ci_counter = $db->query_read ("
          SELECT drc.mod_addons AS addon, drc.threadid, thread.threadid AS threadid, thread.title AS threadtitle
          FROM `" . TABLE_PREFIX . "modsys_settings` AS drc 
          LEFT JOIN `" . TABLE_PREFIX . "thread` AS thread ON(drc.mod_addons=" . $threadinfo['threadid'] . ") 
          WHERE thread.threadid IN (" . $addons['threadid'] . ")
      ");

      $counter = $db->fetch_array ($ci_counter);
      if($counter != ''){
      $post['addons'] .= '<li><a href="showthread.php?t=' .$addons['threadid'] . '">'. $counter['threadtitle'] .'</a></li>';
      }

    }

为什么我会返回重复的结果？

Why am I returning duplicate results?

php

mysql

vbulletin

duplicates

while-loop