Php 数据放入下拉列表

我想从MySQL获取数据并将其插入我的导航栏。我的问题是，一些数据必须放在下拉列表下，但它会创建一个新的主列表项

这是现在的屏幕截图，但我希望在下拉菜单中插入

面板

列

我的数据库结构：

---

我认为您遇到的问题是，您将子菜单视为与主导航栏项目相同的内容。下面是一个可能的解决方案，我已经做了一些重格式重构，尝试将逻辑部分放在顶部，以便解决方案更加清晰。我倾向于同意前面的评论者（@Scott）的观点，即从长远来看，创建表的父子关系将是更易于维护的实践

<?php 
// Make query
$query = $connect->prepare("SELECT * FROM `ucp_navbar` WHERE `Kategorie` = 0");
$query->execute();

// Setup containers for list items
$nav = array();
$dropdown = array();

// Iterate query
while ($row = $query->fetch()) {
  // Assign built list item to either navbar or dropdown arrays
  switch ($row['Panel']) {
    case 0:
      $nav[] = buildListItem(
        htmlentities($row['Link']),
        htmlentities($row['Icon']),
        echo htmlentities($row["Name"]),
        true
      );
      break;
    case 1:
      $dropdown[] = buildListItem(
        htmlentities($row['Link']),
        htmlentities($row['Icon']),
        echo htmlentities($row["Name"])
      ); 
  }  
}

// Add dropdowns to main nav and convert array of nav items to string.
$nav[] = buildDropdown($dropdowns);
$navbar = implode("", $nav);

/**
 * Builds an individual list item.
 *
 * @param string $link URL to use for href
 * @param string $icon font-awesome icon to use
 * @param string $name display name for navbar
 * @param bool   $active adds nav-active class when true
 *
 * @return string formatted single list item
 */
function buildListItem($link, $icon, $name, $active = false)
{
  $class = ($active) ? ' class="active nav-active"': ""
  return "<li{$class}><a href=\"{$link}\"><i class=\"fa fa-{$icon}\" aria-hidden=\"true\"></i>{$name}</a></li>";
}

/**
 * Construct dropdown list item.
 *
 * @param array $dropdowns group of dropdown list items 
 *
 * @return string formatted dropdown list for navbar
 */
function buildDropdown($dropdowns)
{
  $list = implode("", $dropdowns);
  return <<<EOT 
  <li class='dropdown'>
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
        <i class='fa fa-user' aria-hidden='true'></i> 
        Account<span class="caret"></span>
      </a>
      <ul class="dropdown-menu">
          $list
      </ul>        
  </li>
EOT;
}
?>

<div class='collapse navbar-collapse' id='bs-example-navbar-collapse-1'>
<ul class='nav navbar-nav'>
   <?php echo $navbar; ?>
</ul>

也许我遗漏了什么，但你怎么知道应该放在哪个下拉列表下？如果Panel==1，那么它是否在所有下拉列表下？根据第一张图片，您有两个下拉列表，称为Account。DB结构没有指明哪些是下拉列表。大多数时候，当你这样做的时候，你应该有一个父子关系在那里，而不是面板，可能应该是这个链接显示的“父”的id，如果它是0，那么它就不是一个下拉列表。感谢的家伙，我测试了它，它工作了！非常感谢，现在我知道如何处理动态下拉列表：）

<?php 
// Make query
$query = $connect->prepare("SELECT * FROM `ucp_navbar` WHERE `Kategorie` = 0");
$query->execute();

// Setup containers for list items
$nav = array();
$dropdown = array();

// Iterate query
while ($row = $query->fetch()) {
  // Assign built list item to either navbar or dropdown arrays
  switch ($row['Panel']) {
    case 0:
      $nav[] = buildListItem(
        htmlentities($row['Link']),
        htmlentities($row['Icon']),
        echo htmlentities($row["Name"]),
        true
      );
      break;
    case 1:
      $dropdown[] = buildListItem(
        htmlentities($row['Link']),
        htmlentities($row['Icon']),
        echo htmlentities($row["Name"])
      ); 
  }  
}

// Add dropdowns to main nav and convert array of nav items to string.
$nav[] = buildDropdown($dropdowns);
$navbar = implode("", $nav);

/**
 * Builds an individual list item.
 *
 * @param string $link URL to use for href
 * @param string $icon font-awesome icon to use
 * @param string $name display name for navbar
 * @param bool   $active adds nav-active class when true
 *
 * @return string formatted single list item
 */
function buildListItem($link, $icon, $name, $active = false)
{
  $class = ($active) ? ' class="active nav-active"': ""
  return "<li{$class}><a href=\"{$link}\"><i class=\"fa fa-{$icon}\" aria-hidden=\"true\"></i>{$name}</a></li>";
}

/**
 * Construct dropdown list item.
 *
 * @param array $dropdowns group of dropdown list items 
 *
 * @return string formatted dropdown list for navbar
 */
function buildDropdown($dropdowns)
{
  $list = implode("", $dropdowns);
  return <<<EOT 
  <li class='dropdown'>
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
        <i class='fa fa-user' aria-hidden='true'></i> 
        Account<span class="caret"></span>
      </a>
      <ul class="dropdown-menu">
          $list
      </ul>        
  </li>
EOT;
}
?>

<div class='collapse navbar-collapse' id='bs-example-navbar-collapse-1'>
<ul class='nav navbar-nav'>
   <?php echo $navbar; ?>
</ul>