thinkphp5视图文件提交form表单后台接收并打印

<!--header-->{include file="public/_meta" /}<article class="page-container">
  <form class="form form-horizontal" id="form-admin-add" method="post" action="{:url('admin/add')}">
    <p class="row cl">
      <label class="form-label col-xs-4 col-sm-3"><span class="c-red">*</span>管理员名：</label>
      <p class="formControls col-xs-8 col-sm-9">
        <input type="text" class="input-text" value="" placeholder="" id="username" name="username">
      </p>
    </p>
    <p class="row cl">
      <label class="form-label col-xs-4 col-sm-3"><span class="c-red">*</span>密码：</label>
      <p class="formControls col-xs-8 col-sm-9">
        <input type="password" class="input-text" autocomplete="off" value="" placeholder="密码" id="password" name="password">
      </p>
    </p>
    <p class="row cl">
      <p class="col-xs-8 col-sm-9 col-xs-offset-4 col-sm-offset-3">
        <input class="btn btn-primary radius" type="submit" value="  提交  ">
      </p>
    </p>
  </form></article>{include file="public/_footer" /}</body></html>

<?php
namespace app\admin\controller;use think\Controller;class Admin extends Controller{
    public function add()
    {
        //判断是否为post提交
        if (request()->isPost()) {
            //得到post提交的数据
            $data=(input('post.'));
            dump(input('post.'));//打印后，继续执行
            //halt(input('post.'));//相当于 dump() + exit(),打印后，退出 
        } else {
            //加载视图文件
            return $this->fetch();
        }
    }}