在PHP中创建菜单列表：从嵌套列表到多维数组并返回

我必须从可能的子列表中创建一个菜单。 从一个简单的例子中，我想创建一个兼容的引导菜单 从这样的代码中：

<ul>
  <li>Link 1</li>
  <li>Link 2
    <ul>
      <li>Sublink A</li>
      <li>Sublink B</li>
    </ul>
  </li>
  <li>Link 3
    <ul>
      <li>Sublink C</li>
    </ul>
  </li>
</ul>

最后，找回这个：

<ul class="nav navbar-nav">
  <li><a class="primary" href="link_1.html">Link 1</a></li>
  <li class="dropdown">
    <a href="#" class="primary dropdown-toggle" data-toggle="dropdown">Link 2</a>
    <ul class="dropdown-menu">
      <li><a href="sublink_a.html">Sublink A</a></li>
      <li><a href="sublink_b.html">Sublink B</a></li>
    </ul>
  </li>
  <li class="dropdown">
    <a href="#" class="primary dropdown-toggle" data-toggle="dropdown">Link 3</a>
    <ul class="dropdown-menu">
      <li><a href="sublink_c.html">Sublink C</a></li>
    </ul>
  </li>
</ul>

条件是： 如果

有子项has href=“#”，则将类下拉列表添加到gle和数据切换=“dropdown”； 孩子有类“下拉菜单”； 如果

没有父级，则将类“primary”添加到

我使用这段代码，但它仅用于简单列表，而不是嵌套列表

<?php
$currentPage = "";
$contents = "<ul>
  <li>Link 1</li>
  <li>Link 2</li>
  <li>Link 3</li>
</ul>";

// remove width, height, style
$contents = preg_replace('/(width|height|style|target)="[^"]+"/i', "", $contents);
// remove spaces form li
$contents = str_replace(array('<li >',' <li >'),"<li>",$contents);
// remove ul/ol tag and tabs
$contents = str_replace(array('\t','<ul>','<ul >','</ul>','<ol>','<ol >','</ol>'),"",$contents);
$arrNavTopList = explode("\n",trim($contents));
echo "<h4>Array:</h4>\n";
print_r($arrNavTopList);
echo "<hr>\n<h4>List:</h4>\n";
$totNavTopList = count($arrNavTopList);
if($totNavTopList>0){
  echo '<ul class="nav navbar-nav">'."\n";
  $countNtL=1;
  foreach($arrNavTopList as $pagename) {
    $pagename = str_replace("\t","",$pagename);
    preg_match_all("(<li>(.*?)</li>)", $pagename, $arrLinkList);
    $linktopage = $arrLinkList[1][0];
    if(
      strtolower($linktopage)==strtolower(str_replace("_"," ",$currentPage)) ||
      strtolower($linktopage)=="home" && !(strpos($currentPage,"^")===FALSE)
    ) {
      $active=' class="active"';
    } else {
      $active='';
    }
    echo '<li'.$active.'>';
    if (strstr($linktopage,"http") || strstr($linktopage,"target")) {
      $linktopage = preg_replace('/(style|target)="[^"]+"/i', "", $linktopage);
      $linktopage = str_replace('<a','<a rel="external nofollow" class="_blank"',$linktopage);
      echo $linktopage;
    } else {
      if(strtolower($linktopage)=="home" || strtolower($linktopage)=="home page") {
        echo '<a href="/">'.htmlentities($linktopage).'</a>';
      } else {
        echo '<a href="'.str_replace(" ","_",strtolower($linktopage)).'">'.htmlentities($linktopage).'</a>';
      }
    }
    echo '</li>'."\n";
    $countNtL++;
  }
  echo '</ul>'."\n";
}
?>

---

正如@Soundz所提到的，在发布此类问题之前，你必须做更多的工作，有很多方法可以实现你想要的。我会将嵌套foreach与preg_match或类似的东西一起使用。@Johnride这是一个多么好的方式来表达我仅有的苛刻的词语。主题：一个可以组装它的对象怎么样？至少试试吧，不要偷懒，这里没有人为任何人编写完整的代码，不知何故我会使用递归性。我写了一个代码，可以更改带有链接的列表中的简单列表，但我需要一些不同的东西。这就是为什么我问这里没有张贴任何类型的代码。我没有执行额外步骤的代码，也不想写太多关于请求的内容。
<?php
$currentPage = "";
$contents = "<ul>
  <li>Link 1</li>
  <li>Link 2</li>
  <li>Link 3</li>
</ul>";

// remove width, height, style
$contents = preg_replace('/(width|height|style|target)="[^"]+"/i', "", $contents);
// remove spaces form li
$contents = str_replace(array('<li >',' <li >'),"<li>",$contents);
// remove ul/ol tag and tabs
$contents = str_replace(array('\t','<ul>','<ul >','</ul>','<ol>','<ol >','</ol>'),"",$contents);
$arrNavTopList = explode("\n",trim($contents));
echo "<h4>Array:</h4>\n";
print_r($arrNavTopList);
echo "<hr>\n<h4>List:</h4>\n";
$totNavTopList = count($arrNavTopList);
if($totNavTopList>0){
  echo '<ul class="nav navbar-nav">'."\n";
  $countNtL=1;
  foreach($arrNavTopList as $pagename) {
    $pagename = str_replace("\t","",$pagename);
    preg_match_all("(<li>(.*?)</li>)", $pagename, $arrLinkList);
    $linktopage = $arrLinkList[1][0];
    if(
      strtolower($linktopage)==strtolower(str_replace("_"," ",$currentPage)) ||
      strtolower($linktopage)=="home" && !(strpos($currentPage,"^")===FALSE)
    ) {
      $active=' class="active"';
    } else {
      $active='';
    }
    echo '<li'.$active.'>';
    if (strstr($linktopage,"http") || strstr($linktopage,"target")) {
      $linktopage = preg_replace('/(style|target)="[^"]+"/i', "", $linktopage);
      $linktopage = str_replace('<a','<a rel="external nofollow" class="_blank"',$linktopage);
      echo $linktopage;
    } else {
      if(strtolower($linktopage)=="home" || strtolower($linktopage)=="home page") {
        echo '<a href="/">'.htmlentities($linktopage).'</a>';
      } else {
        echo '<a href="'.str_replace(" ","_",strtolower($linktopage)).'">'.htmlentities($linktopage).'</a>';
      }
    }
    echo '</li>'."\n";
    $countNtL++;
  }
  echo '</ul>'."\n";
}
?>

<?php
/**
 * Traverse an elements children and collect those nodes that
 * have the tagname specified in $tagName. Non-recursive
 *
 * @param DOMElement $element
 * @param string $tagName
 * @return array
 */

 //from: https://stackoverflow.com/a/3049677/1596547

function getImmediateChildrenByTagName(DOMElement $element, $tagName)
{
    $result = array();
    foreach($element->childNodes as $child)
    {
        if($child instanceof DOMElement && $child->tagName == $tagName)
        {
            $result[] = $child;
        }
    }
    return $result;
}

$doc = new DOMDocument();
$doc->loadHTML("<ul>
  <li>Link 1</li>
  <li>Link 2
    <ul>
      <li>Sublink A</li>
      <li>Sublink B</li>
    </ul>
  </li>
  <li>Link 3
    <ul>
      <li>Sublink C</li>
    </ul>
  </li>
</ul>");

//from: https://stackoverflow.com/a/6953808/1596547
# remove <!DOCTYPE 
$doc->removeChild($doc->firstChild);            

# remove <html><body></body></html> 
$doc->replaceChild($doc->firstChild->firstChild->firstChild, $doc->firstChild);

$elements = $doc->getElementsByTagName('ul');
$parentitems = getImmediateChildrenByTagName($elements->item(0),'li');
$elements->item(0)->setAttribute ('class' , 'nav navbar-nav');
foreach ($parentitems as $parentitem)
{
    if($parentitem->childNodes->length > 1) {

        $parentitem->setAttribute ('class' , 'dropdown' );
        $link = $doc->createElement('a',$parentitem->childNodes->item(0)->nodeValue);
        $link->setAttribute ('class' , 'primary dropdown-toggle' );
        $link->setAttribute ('href' , '#');
        $link->setAttribute ('data-toggle','dropdown');
        //$parentitem->nodeValue = null; 
        $old = $parentitem->childNodes->item(0);
        $parentitem->replaceChild($link,$old);

        $parentitem->childNodes->item(1)->setAttribute ('class' , 'dropdown-menu' );
        $submenuitems = getImmediateChildrenByTagName($parentitem->childNodes->item(1),'li');

        foreach($submenuitems as $submenuitem)
        {
            $link = $doc->createElement('a',$submenuitem->nodeValue);
            $link->setAttribute ('href' , $submenuitem->childNodes->item(0)->nodeValue.'.html');
            $submenuitem->nodeValue = null; 
            $submenuitem->appendChild($link);
        }   


    }
    else 
    {
        $link = $doc->createElement('a',$parentitem->nodeValue);
        $link->setAttribute ('class' , 'primary' );
        $link->setAttribute ('href' , $parentitem->childNodes->item(0)->nodeValue.'.html');
        $parentitem->nodeValue = null; 
        $parentitem->appendChild($link);
    }


}   

echo $doc->saveHTML();