我要在我的第一期和第四期<代码><ol>tag中添加两个不同的类别特性,但我确实不知道如何在我的休养职能中添加这种特性? 谁能帮助我?

这里是我的购买力平价。

function make_list ($parent = 0, $parent_url =   ) {
    global $link;
    echo  <ol> ;

    foreach ($parent as $id => $cat) {
        if($cat[ parent_id ] ==  0 ){
            $url = $parent_url . $cat[ url ];
            echo  <li><a href="  . $url .  " title="  . $cat[ category ] .   Category Link" style="color: orange; font-weight: bold;">  . $cat[ category ] .  </a> ;            
        } else {
            $url = $parent_url . $cat[ url ];
            // Display the item:
            echo  <li><a href="  . $url .  " title="  . $cat[ category ] .   Category Link">  . $cat[ category ] .  </a> ;
        }

        if (isset($link[$id])) {
            make_list($link[$id], $url);
        }               
        echo  </li> ;
    }       
    echo  </ol> ;
}

$mysqli = mysqli_connect("localhost", "root", "", "sitename");
$dbc = mysqli_query($mysqli,"SELECT * FROM categories ORDER BY parent_id, category ASC");
if (!$dbc) {
    print mysqli_error();
} 

$link = array();

while (list($id, $parent_id, $category, $url, $depth) = mysqli_fetch_array($dbc)) {
    $link[$parent_id][$id] =  array( parent_id  => $parent_id,  category  => $category,  url  => $url,  depth  => $depth);
}

make_list($link[0]);

产出

<ol>
   <li>First Nested List</li>
   <li>First Nested List</li>
   <li>First Nested List
      <ol>
        <li>Second Nested List</li>
        <li>Second Nested List</li>
        <li>Second Nested List
          <ol>
            <li>Third Nested List</li>
            <li>Third Nested List</li>
            <li>Third Nested List
              <ol>
                <li>Fourth Nested List</li>
                <li>Fourth Nested List</li>
                <li>Fourth Nested List</li>
              </ol>
            </li>
            <li>Third Nested List</li>
            <li>Third Nested List</li>
          </ol>
        </li>
        <li>Second Nested List</li>
        <li>Second Nested List</li>
      </ol>
   </li>
   <li>First Nested List</li>
   <li>First Nested List</li>
</ol>