寻求一种html头部公共调用解决方案

header.php:

<header>
      <ul class="am-nav am-nav-pills am-topbar-nav">
              <li><a href="#"<?=$active['index'];?>>首页</a></li>
              <li><a href="#"<?=$active['qa'];?>>答案分类</a></li>
       </ul>
</header>

index.php:

<?php
   $active =  array(
      'index' => ' class="active"',
   );
   include 'header.php';
?>

qa.php :

<?php
   $active =  array(
      'qa' => ' class="active"',
   );
   include 'header.php';
?>