I have xampp and I have a project that extensions are *. html and php code have my localhost php does not interpret the code and displays it as php, but I want to run as php code ex: index.html
 <?php
      $seccion='inicio';
      require_once("idiomas.html");
      require_once("configurador.html");
      require_once("header_scripts_css.html");
    ?>
    <body class="clearfix">
      <header id="header">
        <?php require_once("header.html"); ?>
      </header>
      <?php require_once("slider.html"); ?>
      <div id="centro">
        <?php require_once("central.html");?>
      </div>
      <?php require_once("footer.html"); ?>
