thinkPHP实现的验证码登录功能示例

<?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'))){          // 注释部分为另外一种从数据库中验证密码的方法          // $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,'用户名或密码错误');        }        else{          $this->redirect('login','',1,'验证码错误');        }      }      $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(        'imageW'  => 150,        'imageH'  => 40,        'fontSize' => 20,        'length'  => 4      );      $obj = new /Think/Verify($config);      $obj->entry();    }  }