怎么给 input标签赋予PHP动态参数值?
 

 <?php
  /*请尊重作者,转载请不要删除版权!谢谢 */
  error_reporting(0);
  header('charset=utf-8');
  if (!empty($_GET['domaintest']))
  $domaintest = $domaintest;
  ?>
  <h1>格普域名 查询</h1>
  <hr class="intro-divider" />
  <div class="input-group">
  <input type="text" class="form-control" id="domain" value=<?php echo "$domaintest"?> placeholder="请输入域名" />
  <span class="input-group-btn">
  <button type="button" class="btn btn-default" id="button">
  点击查询
  </button>
  </span>