Implementation example of thinkphp verification code login function

The example of this article describes the verification code login function implemented by thinkPHP. Share it with everyone for your reference, the details are as follows:

Use thinkphp's own verification to verify the account password + verification code on the login page

<?php
  namespace Admin\Controller;
  use Think\Controller;
  use Think\Verify;
  class LoginController extends Controller{
    public function login(){
      if($_POST){
        $obj = new Verify();
        if($obj->check(I(&#39;post.yanzhengma&#39;,&#39;&#39;,&#39;trim&#39;))){
          // 注释部分为另外一种从数据库中验证密码的方法
          // $data[&#39;name&#39;] = I(&#39;post.user_name&#39;);
          // $data[&#39;psd&#39;] = I(&#39;post.password&#39;);
          // $row = M(&#39;user&#39;)->where($data)->find();
          $name = I(&#39;post.user_name&#39;);
          $psd = I(&#39;post.password&#39;);
          $str = &#39;name ="&#39;.$name. &#39;" and tel = "&#39;.$psd.&#39;"&#39;;
          var_dump($str);
          $row = M(&#39;user&#39;)->where($str)->find();
          if($row)
            $this->redirect("Index/index");
          else
            $this->redirect(&#39;login&#39;,&#39;&#39;,1,&#39;用户名或密码错误&#39;);
        }
        else{
          $this->redirect(&#39;login&#39;,&#39;&#39;,1,&#39;验证码错误&#39;);
        }
      }
      $this->display();
    }
    public function verifyImg(){
      //设置验证码的宽高字体大小以及验证码的个数，设计其他的参照Think\Verify里面的设置
      $config=array(
        &#39;imageW&#39;  => 150,
        &#39;imageH&#39;  => 40,
        &#39;fontSize&#39; => 20,
        &#39;length&#39;  => 4
      );
      $obj = new \Think\Verify($config);
      $obj->entry();
    }
  }

Form part

<form action="login" method="post">
  <table valign="top" width="50%">
 <tr><td colspan="2"><h4 style="letter-spacing:1px;font-size:16px;">RainMan 网站管理后台</h4></td></tr>
 <tr><td>管理员：</td><td><input type="text" name="user_name" value="" /></td></tr>
 <tr><td>密    码：</td><td><input type="password" name="password" value="" /></td></tr>
 <tr><td>验证码：</td>
   <td><input type="text" name="yanzhengma" value="" style="width:80px;"/></td>
   <td><img src="URL/verifyImg" onclick="this.src=&#39;URL/verifyImg/&#39;+Math.random()" alt=""/></td>
 </tr>
 <tr class="bt" align="center"><td> <input type="submit" value="登陆" /></td><td> <input type="reset" value="重填" /></td></tr>
  </table>
</form>

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