Example of verification code login function implemented by thinkPHP

This paper describes the verification code login function realized by thinkPHP. Share it for your reference, as follows:

Use the verification provided by thinkphp to realize the verification of 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('post.yanzhengma','','trim'))){
          //  The comment section is additional 1 A method of verifying passwords from a database 
          // $data['name'] = I('post.user_name');
          // $data['psd'] = I('post.password');
          // $row = M('user')->where($data)->find();
          $name = I('post.user_name');
          $psd = I('post.password');
          $str = 'name ="'.$name. '" and tel = "'.$psd.'"';
          var_dump($str);
          $row = M('user')->where($str)->find();
          if($row)
            $this->redirect("Index/index");
          else
            $this->redirect('login','',1,' Wrong username or password ');
        }
        else{
          $this->redirect('login','',1,' Verification code error ');
        }
      }
      $this->display();
    }
    public function verifyImg(){
      // Set the width, height, font size and the number of verification codes, and design other references Think\Verify The settings inside 
      $config=array(
        'imageW'  => 150,
        'imageH'  => 40,
        'fontSize' => 20,
        'length'  => 4
      );
      $obj = new \Think\Verify($config);
      $obj->entry();
    }
  }

Form section

<form action="login" method="post">
  <table valign="top" width="50%">
 <tr><td colspan="2"><h4 style="letter-spacing:1px;font-size:16px;">RainMan  Website management background </h4></td></tr>
 <tr><td> Administrator: </td><td><input type="text" name="user_name" value="" /></td></tr>
 <tr><td> Dense &nbsp;&nbsp;&nbsp;&nbsp; Code: </td><td><input type="password" name="password" value="" /></td></tr>
 <tr><td> Verification code: </td>
   <td><input type="text" name="yanzhengma" value="" style="width:80px;"/></td>
   <td><img src="__URL__/verifyImg" onclick="this.src='__URL__/verifyImg/'+Math.random()" alt=""/></td>
 </tr>
 <tr class="bt" align="center"><td>&nbsp;<input type="submit" value=" Landing " /></td><td>&nbsp;<input type="reset" value=" Refill " /></td></tr>
  </table>
</form>

Readers who are interested in thinkPHP can check the topics of this site: "ThinkPHP Introduction Tutorial", "thinkPHP Template Operation Skills Summary", "ThinkPHP Common Methods Summary", "codeigniter Introduction Tutorial", "CI (CodeIgniter) Framework Advanced Tutorial", "Zend FrameWork Framework Introduction Tutorial" and "PHP Template Technology Summary".

I hope this article is helpful to the PHP programming based on ThinkPHP framework.